2. _____ we were singing, the teacher came in.

A．Before B．after C．As D．Until

3.I was about to leave my house _____the phone rang.

A．while B． when C．as D．after

4.They did not stop fighting_____ there was no enemy left.

A．until B．after C．when D．since

5.I have not seen him_____ he went to college.

A．when B．before C．as D．since

6.It is five days_____ we came here.

A．when B．before C．as D．since

7.It was not long_____ he got to know it.

A．when B．before C．after D．until

8.We shall go_____we are free.

A．whenever B．whatever C．wherever D．however

9. _____I live I must serve the people heart and soul.

A．When B．So long as C．As soon as D．On condition

10.I was reading a novel_____ he was watching TV.

A．when B．while C．before D．as

11.Put the medicine_____you can easily get it.

A．so that B．where C．which D．there

12.We will go_____the Party wants us to go.

A．wherever B．there C．to the place D．which

13. _____ there is a will there is a way.

A．When B．Where C．Whether D．How

14.I am going_____ you went last week.

A．where B．wherever C．when D．the place

15. _____ you go , you should bear the motherland in your mind.

A．Where B．Wherever C．Whatever D．However

16. _____ weather permits, we'll have an outing.