1
I know you ... break this vase but don't do it.
may
can
should
must
2
I don't want to go but I ... .
can
may
better
have to
3
Before taking the test, you ... study first.
must
better
can
may
4
My room was messy and I ... tidy it up.
could
should
better
had to
5
The guard told me that I ... enter the club.
didn't have to
had to
might not
could't
6
You ... go there. The problem has been solved already.
must not
needn't
are not to
can't
7
If you want to stay in shape, you ... every day.
must
should
ought to
are to
8
Children ... watch stupid vines on the Internet.
are not to
shouldn't
don't have to
can't
9
Helen promised that she would come. She ... be there by 5 o'clock.
can
may
has to
should
10
You ... forget to pay my money back by noon.
can not
may not
must not
are not