I think _ is impossible for me to climb such a high mountain.
A. it B. this C. that
Let's stop for a few minutes. I'm tired to walk any farther.
A. so B. enough C. too
--- __ salt did you put in the soup?
--- None. I forgot.
A. How much B. How many C. How long
I had a good time my stay in Chengdu this summer vacation.
A. on B. during C. in
We a party to welcome the new students next Friday evening.
A. have B. had C. will have
--- Why do you tennis for exercise?
--- To keep healthy.
A. take up B. grow up C. stay up