3. How would you use the _____________(科学的 ) method to solve the problems?

2. Children are naturally ____________ ( 好奇的) about everything around them.

1. You should be more _____________ ( 耐心的 ) with others.

20.Much of the work is _____ before sunset.

　 A. finished　　　　 B. to finish it　　　 C. being finished　　 D. to be finished

19._______ such heavy pollution already ,it may now be too late to clean up the river.

　 A. Having suffered　 B. Suffering　　　 C. To suffer　　　　 D. Suffered

18.Tom, don’t ____ such foolish things.

　 A. be addicted with　 B. addicted to　　 C. addict yourself to　 D. addict yourself with

17.After the anti-terrorist war, the American soldiers returned home,_____.

　 A. safe but tired　　 B. safely but tired　 　C. safe and tiring　　 D. safely and tiring

16.---Do you know our town at all?

　 ----No ,this is the first time that I______ here.

　 A. was　　　　　　 B. have been　　　 C. came　　　　　　 D. am coming

15.He will not let out the secret ____ he knows it.

　 A. unless　　　　　 B. whether　　　 C. however　　　　 D. even if

14.Christmas being a holiday, most of the shops remain _____ today.

　 A. locked　　　　　 B. locking　　　 C. to be locked　　　 D. to be locking