Unit 3. 根据句意用since或for填空。1. His grandma has lived in the village _ sixty years.2. Jill hasnt eaten anything _ yesterday morning. 3. We have been here _ two days ago.4. Peter has played football _ half an hour.5. The Smiths have worked on the farm _ they came here. 根据括号内的要求完成下列各题，每空一词（含缩略形式）。1. He bought the computer three weeks ago. (改写句子)He _ _ the computer since three weeks ago.2. Mary borrowed the book seven days ago. (改写句子)Mary _ _ the book for seven days.3. She has played sports since 8:00 am. (改为否定句)She _ _ sports since 8:00 am.4. Ms Jackson has taught for ten years. (对划线部分提问)_ _ _ Ms Jackson _?5. His dog has been dead for five days. (改为同义句)His dog has been dead _ five days _. 根据材料内容，从方框中选择恰当的单词填空，使材料意思完整、通顺，有的需要变换形式，每词限用一次。tired, either, cold, big, they, health,exercise, try, school, watchDave is my cousin. When he was small, he was not very (1)_. He always looked weak. I often saw him in the hospital. Sometimes he caught a(n) (2)_. And sometimes he had a toothache. Daves heart was not healthy (3)_. Because of these, he didnt go to (4)_ until he was ten.One day, Dave (5)_ the mens marathon (马拉松) on TV. The runners neednt go fast and they just ran on and on. He decided to have a(n) (6)_. The next day, Dave started to (7)_. And he trained hard.The race (比赛) day came. There were 100 runners and they were all (8)_ than Dave. They all started fast. Dave tried to keep up with (9)_, but he fell farther and farther behind. Some time later, some boys got (10)_. Dave passed a boy and he passed another one. He just ran and ran. At last he was the first one to cross the finishing line.答案Unit 3. 1. for 2. since 3. since 4. for 5. since. 1. has had 2. has kept 3. hasnt played 4. How long has; taught 5. since; ago. 1. healthy 2. cold 3. either 4. school 5. watched 6. try 7. exercise 8. bigger 9. them 10. tired