John, look at the time. ______ you play the piano at such a late hour?
| A．Must | B．Can | C．May | D．Need |
breathe
| A．thick | B．southern | C．mathematics | D．method |
stop
| A．lose | B．woman | C．shock | D．rose |
So lost in their computers____that leaders at summer computer camps often have to force them to break for sports and games.
| A．became the children | B．become the children |
| C．had the children become | D．do the children become |
The police need some more evidence ________they can make a conclusion.
| A．since | B．before | C．after | D．until |
With the development of science, more new technology ______to the field of IT.
| A．has introduced | B．is being introduced | C．is introduced | D．was introduced |