Les modaux

1 - What is she complaining about ? She ... have warned us.
would
must
ought to
may
2 - I ... be wrong, but I feel he will become a prominent politician.
may
should
have to
am able to
3 - Professor Adams isn't in. He ... to London.
should have gone
might have gone
had to go
is able to go
4 - Too many people are now saying he ... now to resign from the Government.
ought
need
dares
should
5 - They ... taken the wrong way or else they ... be already here.
should have - can't
needn't have - should
must have - would
can't have - may