My new novel has disappeared.Who _______ have taken it?
Witout the air to hold some of the sun’s heat, the earth at night ________, too cold for us to live.
The patient is supposed to go to the hospital for ___________ checks.
—Do you think we should accept that offer? — Yes, we should, for we ___such bad luck up till now, and time __ out.
It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it.
Hawking is _________success, _________disabled man though he is.