There is a system ________the waste is disposed of using the principles of ecology.

There is a system ________the waste is disposed of using the principles of ecology.

#76233

which

where

that

at which

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I'll never forget the day _________ I was born．

#77701

when

that

on which

both A and C

Xi’an was the last city ______ he visited in China.

#75158

where

which

that

in which

Is there anything ________ I can do for you?

#77719

which

who

that

whom

I’m afraid this is the best way ____we can think of ____you.

#78603

that; helping

that; to help

which; helping

which; to help

He may win the first prize in the national competition, _______ he is likely to be admitted to Peking University.

#75931

in which case

in that case

in what case

in whose case

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