diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 8d2e56c0e..1e58ffb6c 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -1,5 +1,21 @@
 package practice;
 
-public class CandidateValidator {
-    //write your code here
+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_YEARS_IN_UKRAINE = 10;
+    private static final String REQUIRED_NATIONALITY = "Ukrainian";
+
+    @Override
+    public boolean test(Candidate candidate) {
+        String[] years = candidate.getPeriodsInUkr().split("-");
+
+        return candidate.getAge() >= MIN_AGE
+                && candidate.isAllowedToVote()
+                && candidate.getNationality().equals(REQUIRED_NATIONALITY)
+                && (Integer.parseInt(years[1])
+                - Integer.parseInt(years[0])) >= MIN_YEARS_IN_UKRAINE;
+    }
 }
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 57b1ca2e2..5ea059c67 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -1,7 +1,10 @@
 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.Person;
 
@@ -14,7 +17,15 @@ 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()
+                .map(e -> e.split(","))
+                .flatMap(e -> Arrays.stream(e))
+                .mapToInt(e -> Integer.parseInt(e))
+                .filter(e -> e % 2 == 0)
+                .min()
+                .orElseThrow(() ->
+                        new RuntimeException("Can't get min value from list: " + numbers)
+                );
     }
 
     /**
@@ -23,7 +34,11 @@ 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(i -> (i % 2 != 0) ? numbers.get(i) - 1 : numbers.get(i))
+                .filter(e -> e % 2 != 0)
+                .average()
+                .orElseThrow(() -> new NoSuchElementException());
     }
 
     /**
@@ -35,7 +50,10 @@ 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(e -> e.getSex().equals(Person.Sex.MAN)
+                        && e.getAge() >= fromAge && e.getAge() <= toAge)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +68,13 @@ 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(e ->
+                        (e.getSex().equals(Person.Sex.MAN)
+                        && e.getAge() >= fromAge && e.getAge() <= maleToAge)
+                        || (e.getSex().equals(Person.Sex.WOMAN)
+                                && e.getAge() >= fromAge && e.getAge() <= femaleToAge))
+                .collect(Collectors.toList());
     }
 
     /**
@@ -59,7 +83,11 @@ 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(e -> e.getSex().equals(Person.Sex.WOMAN) && e.getAge() >= femaleAge)
+                .flatMap(e -> e.getCats().stream())
+                .map(e -> e.getName())
+                .collect(Collectors.toList());
     }
 
     /**
@@ -75,6 +103,12 @@ 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 candidateValidator = new CandidateValidator();
+
+        return candidates.stream()
+                .filter(e -> candidateValidator.test(e))
+                .map(e -> e.getName())
+                .sorted()
+                .collect(Collectors.toList());
     }
 }