It doesn’t matter how many times you fail；_________ matters is how many times you stand up and try again．
| A．which | B．that | C．who | D．what |
As time went by , the theory he had stuck ______ correct .
| A．to prove | B．to proving | C．to proved | D．to be proved |
Studies show that MP3 people have made much use of _____ music may be causing hearing loss.
| A．enjoy | B．to enjoy | C．enjoying | D．enjoyed |
When the winter _____ , all the construction works in northern China have to be stopped .
| A．sets off | B．sets out | C．sets aside | D．sets in |
If the balance of nature is ____ , a series of problems will arise .
| A．disturbed | B．troubled | C．interrupted | D．confused |
.This is Mr. White , ____ I think has something interesting to tell you .
| A．which | B．whom | C．that | D．who |