8. neither very tall nor very strong, they were a good team

7. very difficult to answer the question

6. watching the children playing games

5. takes my father one and a half hours ( one hour and a half) to go to work

4. too heavy for the boy to carry

3. discuss the difficult problem now

2. better not go swimming alone

1. You should come here earlier

89．无论多么困难，我都不会放弃。

　 　　　　　　　　　　　　　　，I'll never give up．

KEY

88．是否要下雨，我说不准。

　 　　　　　　　　　　　　　　it is going to rain．