________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.

 ________ you have to do the job, you should try your best to do it well even though it may be very difficult for you.

#30258

Since

While

Unless

Though

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_____ I’m willing to help, I do not have much time available．

#79625

While

When

Once

Since

I haven’t read the book for __________ long _______I’ve forgotten what it is about.

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such; that

so; as

so; that

such; as

—How long have you been working as an assistant here?—__________I finished middle school.

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Ever since

Before

After

When

Nobody would stand out admitting the fact, for some reason, ________ they lost the game.

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that

which

what

why

Scientists study ___________ human brains work to make computer.

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when

how

that

whether

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