Tsinghua University, in 1911, is home to a great number of outstanding figures.
| A．found | B．founding |
| C．founded | D．to be founded |
So difficult ______ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find | C．I have found | D．have I found |
Speaking of all the songs he has written，I think this one probably ______ everyone.
| A．is betterknown to | B．is wellknown to |
| C．is bestknown to | D．is mostknown to |
Being able to speak another language fluently is a great ______ when you're looking for a job.
| A．chance | B．importance | C．advantage | D．assistant |
Mary wanted to travel around the world all by herself，but her parents did not ______ her to do so.
| A．forbid | B．allow | C．follow | D．ask |
Now I come here at the ______ of Mr.Smith to assist him finishing the work.
| A．require | B．remark |
| C．demand | D．request |