用所给动词的适当形式填空。

1. Listen! Some of the girls ______ (talk) about Harry Potter.

2. - Where is Mr. Green now? I haven't seen him for a few days.

   -He ______ (go) to Hong Kong.

3. You'd better ______ (not eat) too much meat. You are already overweight.

4. "Titanic" is a very nice film. I ______ (see) it twice.

5. There ______ (be) an English Evening next Monday.

6. I spent half an hour ______ (finish) doing my homework.

7. The teacher told Xiao Ming ______ (not be) late for school again.

8. Please write to me as soon as you ______ (reach) Shanghai.

9. Mr. Le is out. But he ______ (be) back in ten minutes.

10. When the headmaster came into the hall, all the students ______ (stand) up.

GSM系统组成要素包括（）。

A.移动台（MS）

B.基地台系统（BSS）

C.移动服务交换中心（MSC.

D.网络维护运营中心（OMC.

E.资料库（DatabasE.-HLR、VLR、AUC、EIR等