After problems are posed, we should sort them out, ______ the advantages and disadvantages and decide what to do.
| A．weigh | B．think | C．range | D．examine |
In Disneyland every year, some 800,000 plants are replaced because Disneyland refused to _______ signs asking his “guests” not to step on them.
| A．put down | B．put out | C．put off | D．put up |
We don’t think the experiment is _______ failure. At least we have gained _______ experience for future success.
| A．the; a | B．a; an | C．a; / | D．/; the |
—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?
—_______ my students have a try?
| A．May | B．Must | C．Shall | D．Will |
We hurried all the way to the airport, only ______ that the flight had been cancelled because of the foggy weather.
| A．being told | B．to be told | C．having told | D．to have been told |
—Are you pleased with what he has done?
—Not at all. It couldn’t be _______. Why didn’t he put more effort into his work?
| A．any worse | B．much better | C．so bad | D．the best |