用括号内所给动词的适当形式填空。

1. Listen!The girl________(sing) in the room.

2. What time________your mother________(go) to work every day?

3. May I________(borrow) your eraser?

4. Mrs Black________(not work) in the factory.

5. Tom usually________(come) to school at seven in the morning.

6. Jack________(swim) in the river now.

7. ________(be) there any milk in the cup?

8. The students________(have) an English class yesterday.

9. — What are you doing?  — I________(mend) the bike.

10. Sue________(clean) the windows every day.

如何理解俄罗斯对外政策的调整？