He____know the answer, but I’m not sure.
A. maybe B. may be C:may D. must
He didn’t go to bed _______ his mother came back.
A.until | B.if | C.as soon as | D.when |
It is ___________ to hold the water.
A.strong enough | B.enough strong |
C.too strong | D.to strong |
You must have breakfast, _________ you may have a stomachache.
A.or | B.and | C.but | D.so |
It is difficult ________me _______ English well. But I’ll study harder.
A.to, learn | B.for, learning |
C.for, to learn | D.to, to learn |
Don’t swim here ,or you may be __________.
A.in danger | B.danger | C.safe | D.well |