EX1:
1. to lock - leaving
2. informing
3. to persuade - agree
4. to smoke
5. is crawling
6. meeting
7. leaving
8. talking
9. Having seen
10. to post
11. to lock
12. paying
13. leaking
14. to philander
15. feeling, stopped to buy
16. to make - believe

EX3:
1. making
2. arguing- working
3. crying
4. holding
5. speaking
6. eating
7. not to touch
8. growing
9. reading
10. asking - to tell - to get
11. reading - smoking
12. to read
13. to wait
14. putting
15. working - going
16. to light
17. working - finishing
18. to swim
20. to explain - listening
21. staying - shouting
22. sneezing - sitting

11. Mr Hai is too old to apply for that job
12. Children are too young to join this club
13. The test is too difficult for us to do
14. The house is too expensive for my uncle to buy
15. We are not rich enough to buy a car
16. The shoes are not cheap enough for me to buy
17. The task is not easy enough for us to do
18. The robber ran too fast for the police to catch
19. They are walking too slowly to reach the top before night
20. Mr Ba doesn't speak cearly enough for us to understand
21. She is the last person to come in
22. It is careless of you to let the door open last night
23. It is necessary for us to finish the work this afternoon