More historical buildings in the old town will fall down _______

More historical buildings in the old town will fall down ________we try our best to protect them.

#55384

since

unless

in order that

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They didn’t go to bed ________ they finished their homework.

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when

because

until

I don’t like science _______ it’s difficult.

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but

because

and

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such; that

too; to

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so; to

__ we are young, we can still do something to help protect the environment.

#58217

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---_____do you visit your uncle?---once a week .

#56274

How long

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