12. By ten o’clock yesterday they _______ at the airport.

　 A. had arrived　　 　B. have arrived　　　 C. shall arrive　　　 D. arrive

11. Neither you nor he ________ New York city.

　 A. has gone to　　 B. have gone to　　 C. have been to　　 D. has been to

10. The workers __________ many toys in the factory last year.

　 A. invent　　　　 B. invented　 　　　C. invention　　　　 D. inventing

9.They ________ friends since they met in Shanghai.

　 A. have made　　　 B. have become　　　 C. have been　　 D. have turned

8.(　 )The letter _______ a week ago and it______ yesterday.

A. posted; arrived　　　　 B. was posted; arrived

C. is posted; arrived　　　 D. has posted; has arrived

7.( 　) He ________ his homework this time yesterday.

　A． does　　　 B. was doing　　　 C. is doing　　　 D. is

6.(　 ) What ______ they doing then on the hill?

　A. are　　　　 B. were　　　　　 C. is　　　　　 D. was

5.(　 ) Kitty ________ games while I was cooking.

　A. plays　　　 B. was playing　　　 C. make　　　 D. does

4.(　 ) My daughter won’t go to sleep until I _______ back.

　A. go　　　 B. goes　　　 C. have gone　　　　 D. will go

3.(　 ) They told us that they ________ three hundred trees by the time the workers got there.

　A. have planted　 B. planted　　 C. had planted　　 D. were planting