Task 3:
8. height
9. either
10. were
11. went
12. weight
13. How much
14. didn't go
15. did
Task 4:
1. D. too => either
2. C. do => did
3. B. came => come
4. A. teach => teaches
5. D. in => at
6. B. go always => always go
Task 5:
1. Yes, he did.
2. He was very scared before seeing the dentist.
3. Yes, she was.
4. The told him not to worry.