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

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

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which I think is

which I think it is

which I think it

I think it is

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The project is based on an agreement, one of _____ purposes is to ensure that the project can be completed before the deadline.

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whose

which

its

what

During the economic crisis, we should help those for ______life is far from easy．

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whom

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There are about 100 teachers, two thirds of______ are women.

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In our class there are 46 students,     half wear glasses.

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of whom

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