. It’s quite a time _____ Liu Xiang was injured in the foot, but we are sure it won’t be long _____ he returns to the track.
| A．after; when | B．before; since | C．that; when | D．since; before |
During World War II Malta managed to _____ most of Italian and German bombers by throwing up an effective anti-aircraft screen.
| A．put out | B．shut out | C．come across | D．get across |
The room was so quiet that she could hear the _____ of her heart.
| A．hitting | B．beating | C．tapping | D．knocking |
The new safety regulations were agreed on after _____ with the work-force.
| A．conference | B．participation |
| C．intervention | D．consultation |
His test results are not very _____. He does well one week and badly the next.
| A．invariable | B．consequent | C．continuous | D．consistent |
Scientists think they have _____ in their attempt to find the causes of some major dieases.
| A．broken through | B．worked out |
| C．fallen out | D．got round |