―Excuse me, Sir, but could you tell me how to go to the railway station?
―Sorry. You’d better ask, I’m afraid, ______ is a native.

How long do you think it will be _______ scientists succeed in providing a cure for cancer?

I notice Linda is often absent from school because of illness. _______ she is not so healthy as she used to be?

It was from only a few supplies that she had bought in the village ______the hostess cooked such a nice dinner

Please do me a favor----_____ my friend Mr. Smith to Youth Theater at 7:30 tonight.

He made another wonderful discovery, ______ of great importance to science.

---What are you busy doing these days?
---____ the college entrance examination.