diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 8d2e56c0e..5120c3e65 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -1,5 +1,29 @@
 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_CANDIDATE_AGE = 35;
+    private static final String CANDIDATE_NATIONALITY = "Ukrainian";
+    private static final int LIVING_TIME_IN_COUNTRY = 10;
+
+    // string has following view: "2002-2015"
+    private static Integer timeLivingInCountry(String fromTo) {
+        String[] parts = fromTo.split("-");
+        if (parts.length == 2) {
+            return Integer.parseInt(parts[1]) - Integer.parseInt(parts[0]);
+        }
+
+        throw new IllegalArgumentException("Invalid from-to: " + fromTo);
+    }
+
+    @Override
+    public boolean test(Candidate candidate) {
+        return candidate.getAge() >= MIN_CANDIDATE_AGE
+                && candidate.getNationality().equals(CANDIDATE_NATIONALITY)
+                && candidate.isAllowedToVote()
+                && timeLivingInCountry(candidate.getPeriodsInUkr())
+                >= LIVING_TIME_IN_COUNTRY;
+    }
 }
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 57b1ca2e2..77bc33eaa 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 +18,12 @@ 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(",")))
+            .mapToInt(Integer::parseInt)
+            .filter(i -> i % 2 == 0)
+            .min()
+            .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + numbers));
     }
 
     /**
@@ -23,7 +32,14 @@ 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())
+            .mapToDouble(index -> index % 2 == 0
+                ? numbers.get(index).doubleValue()
+                : numbers.get(index).doubleValue() - 1)
+            .filter(i -> (int)i % 2 == 1 || (int)i % 2 == -1)
+            .average()
+            .orElseThrow(NoSuchElementException::new);
     }
 
     /**
@@ -35,7 +51,10 @@ 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(person -> Person.Sex.MAN.equals(person.getSex())
+                && person.getAge() >= fromAge && person.getAge() <= toAge)
+            .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +69,11 @@ 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(person -> Person.Sex.MAN.equals(person.getSex())
+                ? person.getAge() >= fromAge && person.getAge() <= maleToAge
+                : person.getAge() >= fromAge && person.getAge() <= femaleToAge)
+            .collect(Collectors.toList());
     }
 
     /**
@@ -59,7 +82,12 @@ 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(person -> Person.Sex.WOMAN.equals(person.getSex())
+                && person.getAge() >= femaleAge)
+            .flatMap(woman -> woman.getCats().stream())
+            .map(Cat::getName)
+            .collect(Collectors.toList());
     }
 
     /**
@@ -75,6 +103,10 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      * parametrized with Candidate in CandidateValidator.
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
-        return Collections.emptyList();
+        return candidates.stream()
+            .filter(new CandidateValidator())
+            .map(Candidate::getName)
+            .sorted()
+            .collect(Collectors.toList());
     }
 }