He _______ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
If you cheat in the exam, you could hardly _________ it.
No potatoes for me—I’m _______ a diet.
You ______be sitting in this waiting room, sir. You see, it is for women and children only.
The children are full of ______. They have been playing all day long without resting.
It looks like rain, so you’d better ______ without an umbrella.