— Can you come on Friday or Saturday?
— I’m afraid ______ is possible．I will go to the hospital to look after my friend．

We don’t know the reason _____ he didn’t accept the job.

. There are altogether eleven books on the shelf, _____ five are mine.
A. on which         B. in which     C. of which          C. from which

She has long been expecting a computer belonging to herself and at last she got_________.

Legend has ______ that CaoCao, King of Wei kingdom in the Three Kingdoms period, built 72 tombs to confuse tomb diggers.

He advised farmers to choose the best seed-heads ,__________ that had the best color .

．Some people would rather ride bikes as bike riding has______of the trouble of taking buses.

Jack is going to spend his holiday in Paris next week, _____ lives his uncle.?

. She learnt both business and history, but she knows________of them well, though she can speak on subjects in general.

It's impossible for all the people to get jobs because         of them are not fit for them.