Halfway up the mountain we stopped to ______________.
| A．keep our breath | B．hold our breath | C．be out of breath | D．take breath |
He slipped and broke his leg. ___________, he’ll have to be away from school for two or three months.
| A．As a result | B．On the other hand |
| C．Above all | D．However |
Please go on trying, I’m sure the efforts you are ________ will pay off.
| A．doing | B．giving | C．making | D．sparing |
–Who is the man talking to the headmaster?
–A professor ________ a visit to our school.
| A．pays | B．is paying | C．paid | D．paying |
Scientists found many stones ________ with numbers on the mountains.
| A．marking | B．marked | C．being marked | D．have been marked |
–The plane is due to take off at 7:50 from the airport.
–________ we fail to arrive there in time. –Try to take another flight then.
| A．What if | B．As if | C．Even if | D．Only if |