We can hardly believe that an intelligent person like Daniel ________ be asking such a silly question.

— Hello, may I speak to Mr. Wu? — I’m afraid he is not in now. ______ I take a message?

Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry.

Facts prove that the world’s economic development is not a win-lose game but one in which all _____ be winners.

---I haven’t got the reference book yet, but I’ll have a test on the subject next month.---Don’t worry. You ______ have it by Tuesday.