---The frequent terrible coal mine accidents killed more than 1,000 people in China last year. ---_______.
If you make most of every minute in class day after day, there will be switch in grades.
My English teacher gave us a suggestion yesterday, _____is often the case, ______ our monitor organize a debate after class.
Tsinghua University, ______ in 1911, is home a great number of outstanding figures.
It was three months later _____ he completed the job with difficulty.
He is rather difficult to make friends with, but his friendship, _____ is more true than anyone else’s.