The flu is believed by viruses that like to reproduce in the cells inside the human nose and throat.
There is so much rain on the island that its annual rainfall reaches ________.
Look! The ground is wet. It must have rained last night, ________?
—Did you tell her the bad news? —Yes, but I'd rather ________.
He is only too ready to help others, seldom, ________, refusing them when they turn to him.
A recent study has found that the number of smokers ________ sharply over the past five years.