6.　　 We must do what we can do to keep the ________(平衡) of nature.

5.　　 Doctor, I think I have got a headache. Can you _________(检查) me?

4.　　 This drink is a m_________ of three different sorts.

3.　　 If you are thirsty, I have some ________(矿) spring water for you.

2.　　 Don’t give me meat any more. I am on a d_________.

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

　I wonder if it’s because I haven’t been able to be outdoors for so long that I’ve grown so crazy about everything to do with nature. I can wee remember that there was a time when a deep blue sky, the song of the birds, moonlight and flowers could never have kept me spellbound. That’s changed since I was here.

5．　　　 I __happened_　 __to_　 __be___　 reading_　 upstairs when he came in. (碰巧在读书)

4．　　　 Mother asked Anne why __she 　_had __　 __gone__　 __to____　 __bed___　 so late _the_____　 __night 　__before　 (昨晚那么晚才睡).

3．　　　 I’d like you __to_ list_ the things to be bought at the supermarket. (列个清单).