If we throw away too much waste and can’t keep good ecosystem,we _________ our future.
| A．must have destroyed | B．could be destroying |
| C．may be destroying | D．must destroy |
According to our school rules, students ________ not carry mobile phones when taking a exam.
| A．will | B．may | C．shall | D．need |
Food safety has become a growing concern. Had the offenders been punished severely enough, the situation________ different now.
| A．will have been | B．would have been | C．would be | D．shall be |
Look! Here _____. Let’s get on it.
| A．is coming a bus | B．comes a bus | C．a bus is coming | D．a bus comes |
It is such a good place everybody wants to go and visit it is well known all over the world.
| A．that; that | B．as; as | C．as; that | D．that; as |
.most parents care about is to provide the best education for their children.
| A．What | B．That | C．How | D．Whether |