（ ）1. There is ________ “u” and ________ “s” in the word “use”.
A. a; a B. a; an C. an; an
（ ）2. There is a lake ________ the middle of the park.
A. on B. in C. at
（ ）3. I get up ________ 6:30 ________ every morning.
A. at; on B. on; in C. at; /
（ ）4. ________ climb the mountains（山）.
A. Not B. Don’t be C. Don’t
（ ）5. A football is __________.
A. under the floor B. under the desk on the floor C. on the floor on the desk
