diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 8d2e56c0e..84bc2fae2 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -1,5 +1,22 @@
 package practice;
 
-public class CandidateValidator {
-    //write your code here
+import java.util.Objects;
+import java.util.function.Predicate;
+import model.Candidate;
+
+public class CandidateValidator implements Predicate<Candidate> {
+    private static final int MIN_AGE = 35;
+    private static final int MIN_PERIOD = 10;
+    private static final String UKRAINIAN = "Ukrainian";
+
+    @Override
+    public boolean test(Candidate c) {
+        String[] parts = c.getPeriodsInUkr().split("-");
+        int start = Integer.parseInt(parts[0]);
+        int end = Integer.parseInt(parts[1]);
+        return c.getAge() >= MIN_AGE
+                && c.isAllowedToVote()
+                && Objects.equals(c.getNationality(), UKRAINIAN)
+                && end - start >= MIN_PERIOD;
+    }
 }
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 57b1ca2e2..cf114d3ca 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -1,8 +1,12 @@
 package practice;
 
-import java.util.Collections;
+import java.util.Arrays;
 import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 import model.Candidate;
+import model.Cat;
 import model.Person;
 
 public class StreamPractice {
@@ -14,7 +18,16 @@ public class StreamPractice {
      * "Can't get min value from list: < Here is our input 'numbers' >"
      */
     public int findMinEvenNumber(List<String> numbers) {
-        return 0;
+        return numbers
+                .stream()
+                .flatMap(str -> Arrays.stream(str.split(",|,\\s*")))
+                .map(String::trim)
+                .filter(n -> !n.isEmpty())
+                .map(Integer::parseInt)
+                .filter(i -> i % 2 == 0)
+                .min(Integer::compare)
+                .orElseThrow(() -> new RuntimeException("Can't get min value from list: "
+                        + numbers));
     }
 
     /**
@@ -23,7 +36,13 @@ public int findMinEvenNumber(List<String> numbers) {
      * But before that subtract 1 from each element on an odd position (having the odd index).
      */
     public Double getOddNumsAverage(List<Integer> numbers) {
-        return 0D;
+        return IntStream
+                .range(0, numbers.size())
+                .map(index -> index % 2 == 1 ? numbers.get(index) - 1 : numbers.get(index))
+                .filter(n -> n % 2 == 1)
+                .mapToDouble(n -> Double.parseDouble(Integer.toString(n)))
+                .average()
+                .orElseThrow(NoSuchElementException::new);
     }
 
     /**
@@ -35,7 +54,11 @@ public Double getOddNumsAverage(List<Integer> numbers) {
      * Example: select men who can be recruited to army (from 18 to 27 years old inclusively).
      */
     public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toAge) {
-        return Collections.emptyList();
+        return peopleList
+                .stream()
+                .filter(p -> p.getSex().equals(Person.Sex.MAN))
+                .filter(p -> p.getAge() >= fromAge && p.getAge() <= toAge)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +73,12 @@ public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toA
      */
     public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
                                           int maleToAge, List<Person> peopleList) {
-        return Collections.emptyList();
+        return peopleList
+                .stream()
+                .filter(p -> (p.getSex().equals(Person.Sex.MAN))
+                        ? p.getAge() >= fromAge && p.getAge() <= maleToAge
+                        : p.getAge() >= fromAge && p.getAge() <= femaleToAge)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -59,7 +87,16 @@ public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
      * return the names of all cats whose owners are women from `femaleAge` years old inclusively.
      */
     public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
-        return Collections.emptyList();
+        return peopleList
+                .stream()
+                .filter(p -> p.getSex().equals(Person.Sex.WOMAN)
+                        && p.getAge() >= femaleAge)
+                .flatMap(person ->
+                        person
+                                .getCats()
+                                .stream()
+                                .map(Cat::getName))
+                .collect(Collectors.toList());
     }
 
     /**
@@ -75,6 +112,12 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      * parametrized with Candidate in CandidateValidator.
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
-        return Collections.emptyList();
+        CandidateValidator validator = new CandidateValidator();
+        return candidates
+                .stream()
+                .filter(validator)
+                .map(Candidate::getName)
+                .sorted()
+                .collect(Collectors.toList());
     }
 }