The whole book __ 12 units, __ two mainly revisions.
Martin Smith who, at 22, is one of the male nannies(保姆) admits that it will be some time ____ male nannies are totally accepted.
—Look! How long ______ like this? —More than 20 days! It’s usual here that rain pours without stopping in May.
The man tried out several means to have those people ______ what he said.
Facts prove that the world’s economic development is not a win-lose game but one in which all _____ be winners.
David apologized for _______ to inform me of the change in the plan.