Unit 8 It must belong to Carla.单元练习
一、单项选择（共15小题；共15分）
1. Students in our school know shouting is not allowed in the library.
A. can B. may C. must D. need
2. --- Is Maria knocking at the door?
--- It be her. She is in Australia now.
A. may not B. needn't C. mustn't D. can't
3. it be true that Albert passed the test in geography?
A. May B. Should C. Could D. Would
4. Eric likes science. He become a scientist when he grows up. I'm not sure.
A. can B. must C. should D. might
5. --- I was from going to Mike's birthday party by the heavy rain.
--- Really? What a pity!
A. caused B. allowed C. ordered D. prevented
6. Today, when we use QQ or MSN, we messages across thousands of miles in a few seconds.