1. Your trousers are d_____. You must wash them.
2. Have you seen my pen? I can't f_____ it.
3. We usually have three m_____ a day.
4. S_____ is the best season for planting trees.
5. We listen with our e_____.
6. Fifteen and twenty-five is f_____.
7. It often s_____ in the north of China in winter.
8. —Have you ever been to Xi'an?
     —Yes, I have been there t_____.

1. Deng Yaping is one of the most o_______ table-tennis players.
2. She's very c_______; She writes and paints a lot.
3. Robert Frost w_______ the Pulitzer Prize (普利策奖) four times in 1923, 1931, 1936, 1942.
4. The Olympic R________ of the high jump was broken by a young athlete.
5. The p_______ received a warm welcome as soon as he returned back from space.
6. "I can't find my pen. Have you seen it?" "No.You must have put it s_______. 
    Look for it more carefully and I'm sure to find it."
7. In order to keep f_______, she jogs every morning.
8. "What are you going to do this afternoon?" "_______ much. I'm quite free."
9.  Which animal do you like _______, monkeys or tigers?
10. John is a college student, but he has a _______ job in a shop.
11. The old woman was 55 years old. After she r_______, she looked after her grandson.