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

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

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when

during which

since when

since then

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John is the only one of the students in the class that never_____ a mistake even when it is pointed to him.

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admit making

admits making

admit to make

admits to make

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

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in whom

in them

of whom

of them

I shall never forget those years ________I lived in the country with farmers，  ________has a great effect on my life.

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that；which

when；which

which；that

when；who

That weekend, 　　　I have more to tell you about, I ended up with a happy hike.

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that

which

what

when

We went through a period _____ communications were very difficult in the rural areas.

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which

whose

in which

with which