Pronunciation:

1. A. rained
2. B. pool

Stress: 3. B. 'massive
4. C. school

Error Correction: 5. C. will have → should be "would have" or "have"
6. C. weren't → should be "didn't they?"
7. A. don't study → should be "study"
8. A. have studied → should be "studied"

Grammar and Vocabulary: 9. B. lots of
10. B. mother
11. A. should go
12. B. too clever
13. C. collection
14. B. Although
15. C. on
16. D. where
17. A. have you
18. A. to win

Closest Meaning: 19. A. contaminates
20. C. hard-working

Opposite Meaning: 21. D. modern
22. B. minority

Correct Response: 23. B. It's nice of you to say so.