—Have you ever corrected these compositions ?—Of course．They are based on true stories．Most of them are from personal _______．

—How much ____the pair of trousers ? —Sixty dollars _____enough .

—A new study proves(证明) a        walk every day is enough to keep people away from fat.

— I have ______ in learning chemistry. Could you help me with it?— Sure, I’d love to.

If you visit Italy, you can go to____and take photos there.