IV. 1---5　 A D C B A　 6---10　 B A C B C

4. disappointed　 5. nervous　　　 6. Envelopes

1. surprised　　 2. murdered　 　　3. destroyed　

9.. silence　　 10. was doing　

III

5. was eating　 6. were watching　 7. surprised　 8. flight　

I. 1-5　 C D C A B　 　　6---10 A D C A A　

11---15 C B A B B　　 16-20 A C A C C

II. 1. arguing　　 2. cooking　　　 3. dressed　　 4. got/would get

I. B A B B B

II. C B C C A

III. F　 T　 F　 T　 F

IV.

1. station　　 2. library　　 3. difficult　　　 4. Wednesday　 5. landed

5.　　 What were you doing when the UFO landed on Center Street?

　　　　　　　　　　 Keys to 检测(二)

4.　　 We have the PE class every Wednesday afternoon.

3.　　 It’s so difficult that no one can work it out.