Although the causes of cancer_____, we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering | C．are uncovering | D．have uncovered |
For the sake of enough time for study and rest, students are _____ from using cellphones in our school.
| A．encourged | B．forbidden | C．required | D．kept |
The relatives of the passengers in the missing Flight MH370 cann’t hide their feelings, _____ they can make sure that the plane will make a safe landing on the airport.
| A．except when | B．except | C．except that | D．except where |
Mr. Bean constantly get into awkward and absurd situations, which greatly amuses audiences _____ their nationalities and culture.
| A．in favor of | B．in terms of | C．according to | D．regardless of |
—Do you think Catherine likes Fred?
—__________. They don’t seem to get on very well together.
| A．It depends | B．I hope so |
| C．I imagine not | D．Sounds reasonable |
—I had the computers repaired yesterday.
—How much did they _________ for that?
| A．cost | B．spend | C．take | D．charge |