I wonder why I can't work out the problem they can. [ ]A. when B. as C. though D. while——青夏教育精英家教网——

I wonder why I can't work out the problem _____ they can.

A. when
B. as
C. though
D. while

He got up early ______ he could get there on time.

A. in order to
B. so that
C. so as to
D. such that

— Look! Here comes the bus.
— No hurry. Don't get on it ______ it stops.

A. until
B. after
C. when

I met a friend of mine _____ I was walking in the park.

A. because
B. after
C. when
D. if

I want to buy a hat ____ I will look more handsome.

[ ]

A. so
B. so that
C. that
D. that so

You will not remember the facts _____ you understand them all.

A. if
B. unless
C. if not
D. because

He met problems ______ he was going over his lessons.

A.before
B.as soon as
C.since
D.while

Ben was unhappy ______ he got a C in the math test.

[ ]

A.because
B.before
C.if
D.when

My father was so tired that he fell asleep he went to bed.

A. as if
B. even though
C. ever since
D. as soon as

Don't touch anything ________ your teacher tells you to.

A. if
B. though
C. unless
D. even though

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