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

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

#55880

when

because

until

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I’m tidy ,  my sister is not.

#56145

and

but

under

always

You will fall behind others_______ you work hard.

#56590

unless

though

since

    --- Hurry up! The bus is coming.--- Wait a minute. Don’t cross the street        the traffic lights are green.

#55220

after

until

while

since

Uncle Tetsu（彻思叔叔）cheese cakes sell well____they are so nice.

#55773

because

but

and

A tourist will easily lose his way in Beijing ______ he has a map or a guide.

#58451

because

unless

when