As many as 150 miners died in the accident．If only the mine - owners ____ enough attention to the safety measures!
| A．paid | B．should pay | C．would pay | D．had paid |
Nothing__________ after the terrible fire which had been caused by someone smoking in bed.
| A．left | B．was remained | C．remained | D．continued |
If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.
A. habit B. law C. rule D. custom
with the size of the whole earth, the highest mountain doesn't seem high at all.
| A．When compared | B．To compare |
| C．While comparing | D．It compared |
He___________ when the bus came to a sudden stop.
| A．was almost hurt | B．was to hurt himself |
| C．was hurt himself | D．was hurting himself |
—What would you wish to do if you were a college student again?
—That's very hard to say, but I wish I when I was a college student.
| A．has not studied biology | B．did study biology |
| C．had studied biology | D．studied biology |