Teachers should ___them to continue studying when some students want to give it up.
#75047
A
encourage
B
keep
C
prevent
D
make
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Not having work out the problem, leave the office.
#63683
A
so he was not allowed to
B
and he didn’t want to
C
the teacher couldn’t make him
D
he couldn’t free himself to
. --- I'm sorry. I ____________ the bike to you yesterday. But I was too busy at that time. --- Never mind.
#63320
A
should return
B
should have returned
C
must return
D
may have returned
I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.
#62250
A
mustn’t
B
needn’t
C
shouldn’t
D
couldn’t
A hard-working man _____ become a great scientist, but a great scientist _____ be a hard-working man.
#75893
A
can’t, can
B
may not, can
C
can’t, must
D
may not, must