I didn’t know ________ the professor would give us a lecture in the hall.

I didn’t know ________ the professor would give us a lecture in the hall.

#55178

where

when

what

why

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We don’t look the same,          we’re twins.

#58136

although

because

however

---You look very healthy. ________do you exercise? -----I exercise three times a week.

#56267

How often

How many

How much

How soon

We won’t start the meeting         our teacher arrives.

#58054

while

until

when

—Don’t play with the knife, ______ you’ll cut your hand.—Sorry, I _____.

#57703

so, can’t

and, won’t

but, mustn’t

or, won’t

---How was your climb up Mount Tai?---I didn’t believe I could do it        I got to the top．

#55282

until

unless

after

when

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