.He is really incompetent! The letter ______ yesterday.a. should be finished typing b. must be finished typingc.must have finished typing d. should have been finished typing
. With a lot of problems ________, the newly – elected headmaster is having a hard time.
. Soon after getting off his horse, the man appeared at the second storey windows,___he could see nothing but trees.
. Tom was very angry about ________ to Mary’s birthday party.
. You can come here to ask me _____ if you have any questions.
. Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.