The dangerous building could fall down any time, but that’s a risk we’ll have to_____.
| A．do | B．take | C．perform | D．make |
The number of the people in the world ______ growing faster and faster.
A. is b. are C. have D. were
I’m sorry to have kept you ________ for a long time.
A. wait b. to wait c. waiting D. to be waiting
The film __________ for ten minutes when we got to the cinema.
| A． had already been on | B．had already begun |
| C．have already been on | D．have already begun |
Three years ____ a long time for us students.
| A．are | B．be | C．is | D．have been |
To a doctor, the most important thing is _______.
A. to save b. saving C. to saving D. saved