Task 4.
1. rich; 2. behaviour; 3. deceithful; 4. provide; 5. seek; 6. conservative; 7. complexion; 8. harsh; 9. remarkable; 10. originally.
Task 5.
1. is having; 2. yet; 3. never; 4. tastes; 5. for; 6. have tried; 7. yet; 8. has; 9. since; 10. just.
Task 6.
1. What have you been doing; 2. Plays; 3. I am going to; 4. They have already eaten; 5. Do you read; 6. Is she surfing; 7. They have been talking to; 8. He doesn't sleep well; 9. When is she going to move; 10. I have been having.
Task 7.
1. Look after; 2. look forward to; 3. Jealous to; 4. Look up