—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.A. can; must B. can; may . must; can D. may; must
Then _______ we had been looking forward to.
Little________what you said. I wish you had repeated it!
He has been to America twice, _____.
There must be ____ with the machine.
---What an amazing film! It’s the most interesting film I’ve ever seen. ----But I’m sure it won’t interest ______.