Learning to write is learning to think. You don’t know things clearly ________

Learning to write is learning to think. You don’t know things clearly _________ you can writethem down.

#55292

unless

since

whether

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Bill can swim, _______ he can’t sing.

#57157

but

and

—The classroom is ____ clean ____ it was yesterday.— Sorry, I forget to clean it.

#56798

as; as

so; as

not so; as

more; than

People along the river didn’t allow them to ______ a factory so as not to pollute the water.

#55767

set up

give up

take up

look up

—Do you have the same hobby with your brother?—No. I like collecting stamps _______ he likes reading.

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for

while

I won’t go to the party       I’m invited.

#58478

when

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after

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