Recently the Ministry of Environmental Protection issued a circular saying that China may adopt flexible working hours and stop school classes_____the highest air pollution warnings.
| A．for fear of | B．in terms of | C．on top of | D．in case of |
____ a strong and fair climate agreement at the key UN summit in Copenhagen, 50,000 people in London wore blue and went to the streets．
| A．Call for | B．Calling for | C．To call for | D．Called for |
It is the test system, rather than the teachers, ____ is to blame for the students' heavy burden nowadays．
| A．who | B．this | C．that | D．whom |
Many children are ____ in the countryside when their parents flood into the cities for jobs．
| A．left behind | B．left off | C．left aside | D．left out |
The UN officials say it could be many weeks and even months ____ a deal is reached．
| A．before | B．after | C．when | D．as |
Either the ways or the time ____ yet, but you may ask the headmaster for some information．
| A．isn’t decided | B．hasn’t decided | C．aren’t decided | D．haven’t decided |