7. in改为from

6.lack改为lacking 或lack后加of

5. improve改为improving

4. later改为late

3. for改为to

2.去掉第二个to

1. that改为when或10 o’clock 前加at

6. to have written　　 7. to be discussed　　 8. preparing　　 9. being polluted　　 10. reading

单句改错

1. Use　　　　　　　 2. accepting　　　　 3. tied　　　　 4. take　　　　　　 5. to help

9.Look what you have done.You would have been more careful.

1-5 BDBBB　 6-10 BBCA/D D　 11-15 CACBC　　 16-20 A A/C CBC　 21-25 ABACB

26-30 ACABA　

1-5 ABCAD　　 6-10 BBADC　 11-15 BDCAA　　 16-20 BBBBA　 21-25 CCBBC　

26-30 AAACB

用动词的适当形式填空