Global warming has become a serious problem, _____

 Global warming has become a serious problem, ______ we must find solutions.

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which

to which

with which

that

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I can never forget the days _____ we worked together and the days ______ we spent happily together.

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when; which

which; when

for which; that

on which; when

I am sure ____ he did is wise.

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that

about that

of that

that what

Jim passed the driving test, __________ surprised everybody in the office.

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what

that

which

This is the house       the window faces south.

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of which

which

of it

whose

The book was written in 1946, _______ the education system has witnessed great changes.

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since then

when

since when

during which

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