—Where’s Bill ? —He ________ in the office. I saw him playing basketball on the playground just now. A. can’t be B. must be C. can be
Do you know _____?
There is _____ knocking at the door. Go and see who it is.
—What was your hometown like five years ago? —It _____ very old and dirty.
I won’t take part in the party _____ Joe invites me..
—Will you go to Jane’s birthday party this evening, Rick? —If Michael won’t, _____.