Read the passage and correct the mistakes, ______．
| A．if not | B．if any | C．if ever | D．if never |
Samuel Clemens，______ Mark Twain, wrote many popular stories.
| A．was known as | B．known as |
| C．was known for | D．known for |
The old man used _____ in front of his house and he has got used to _______ like that.
| A．to sit; doing | B．to sitting; do |
| C．to sit; do | D．to sitting; doing |
You will ______ sooner or later if you keep working like that.
| A．break off | B．break down | C．break into | D．break out |
In the USA, the students who study business is more than _______ those who study agriculture.
| A．as many as ten times | B．as ten times than |
| C．ten times as many as | D．than ten times |
—— Ann is in hospital.
____ Oh ,really? I ______ know. I ______ go and visit her.
| A．didn’t, am going to | B．don’t , would | C．don’t, will | D．didn’t, will |