Is it my age ________the boss minds?—I’m afraid so. He will consider ________ necessary to have an experienced assistant.

Where ___________ your pen pals from — The United States.

If your father knows that you cheated in the exam,he will be ________ a little angry.[ ]

Chinese Chang’e-2, the US sentup a space probe to hit the moon to see ______.

33Once ____you may feel uncomfortable