He _____ have fallen asleep last night because he didn’t hear the phone call.
He didn’t make _____ clear why he was late again.
I can hardly imagine Peter ____ across the Atlantic Ocean in five days.
I wish I ____ clever enough to work out the ____ geometry problem.
If I ____ more about diamond, I ____ cheated by that man.
Some of you may have finished unit one, _____, you can go on to unit two.