If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.

If the machine makes a mistake -- ____ rarely happens -- it gives a warning in the form of a red light.

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that

which

what

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Do you remember the place ________ we visited last year?

#76673

that

where

when

in which

Is this factory    some foreign friends visited last Friday?

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that

where

which

the one

The reason_______ he didn’t come was that he was injured.

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that

why

because

when

For many cities in the world, there is no room to spread out further, ______ New York is an example.

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for which

in which

of which

from which

Two years later, her father disappeared, never to be _________ again.

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heard from

hear about

hear of

heard out

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