用适当的介词或副词填空。

To, with, from…to, for, past, on, in, at

1. She often comes home _        five           the afternoon.

2. I'll take some bread _        me.

3. She goes to work _        seven in the morning _       five in the afternoon.

4. It's time           have our English class.

5. It's half           nine. Time to go to bed.

下列说法正确的是（）。

A、减压器喷嘴的孔径是0.7毫米；

B、空气呼吸器导向喷嘴堵塞的故障现象是需供阀有异常的声音；

C、空气泵和氧气泵可以放在一个工作室，以便操作；

D、清净罐不得和酒精，汽油酸类等物质接近。