Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.
| A．frequently | B．significantly | C．steadily | D．consequently |
Up to now, the weather______ pleasant for the journey. I hope our good luck will continue.
| A．is | B．was | C．has been | D．will be |
—There ______ be anybody in the classroom, for the lights are off.
—I’ll go and check.
| A．mustn’t | B．won’t | C．needn’t | D．can’t |
Chinese students usually spend ______ the students of the US studying in their free time.
| A．twice as many hours as | B．as twice many hours as |
| C．twice hours as many as | D．as many as twice hours |
. She has a strong belief that she will ______ her country to take part in the Olympic Games.
| A．present | B．preserve | C．represent | D．direct |
With all his efforts, ______ he made such great progress.
| A．no wonder | B．no doubt | C．no problem | D．no hurry |