He went back to the hall to try his_________at finding his lost gold watch，but never found it.
| A．best | B．success | C．result | D．luck |
If you make most of every minute in class day after day, there will be switch in grades.
| A．/; / | B．the; a | C．/; a | D．the; / |
My English teacher gave us a suggestion yesterday, _____is often the case, ______ our monitor organize a debate after class.
| A．which, which | B．which, that | C．as, that | D．as, which |
Tsinghua University, ______ in 1911, is home a great number of outstanding figures.
| A．found | B．founding | C．founded | D．to be founded |
It was three months later _____ he completed the job with difficulty.
| A．since | B．before | C．while | D．that |
He is rather difficult to make friends with, but his friendship, _____ is more true than anyone else’s.
| A．Once gaining | B．Once gained | C．Once is gaining | D．Once he gained |