Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom.

Having checked the doors were closed and ______ all the lights were off, the boy opened the door to his bedroom.

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why

that

when

where

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which

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________matters most in learning English is enough practice.

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It is uncertain           side effect the medicine will bring about, although about two thousand patients have taken it.

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You should try to get a good night’s sleep ___ much work you have to do.

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