4. We should remember our past and build our future. We should honour our ______(祖先).

3. Porridge ________(消化) easily.

2. Doctors advise us not to eat fruit which is not r_________.

1. Young people always have more e_________ than the old.

15. Only in this way __ find the way of solving the difficult problem.

A. you can　　 B. would you 　　C. can you　　 　D. you will

14. The flower is dead. I ______ it yesterday.

A. should water　　　　 B. must water　

C. should have watered　 D. mustn’t have watered

13. I wrote a report ____ what I saw and heard.

A. because of　　 B. as a result of　　 C. depended on　 　　D. based on