用适当的词填空。

1. I don't know _____ I can do for you.

2. — Could you tell me _____ the film begins, please?

    — About six o,clock.

3. He doesn't know _____ his father is so worried about him ?

4. — Do you know _____ he gets off the bus?

    — At the next stop.

5. Could you tell me _____ is the man standing over there?

6. Can you tell me _____ that's a fast train or not?

为确保发动机正常起动性和运行，在下列情况（）下，发动机电子控制器将停止混合气浓度反馈修正。

A.发动机温度在60度以下

B.起动时及起动后加浓期间

C.大负荷加浓期期间

D.减速断油期间