---- do the students exercise a week? ---- Once or twice.
A. How long B. How often C. How many times
______ it’s difficult to make her dream come true, she never gives up.
A. Unless B. IfC. Though
___ good job she does! She is really a clever girl.
A. What a B. How C. What
The mobile phone has influenced our life a lot since it_____.
A. invents B. is invented C. was invented
Running man is the most interesting TV program_____ I’ve ever seen.
A. that B. what C. who
It is a good habit for us that we should nevertoday’s work till tomorrow.
A .put on B. put off C. put up