根据句意及汉语提示,用短语的恰当形式完成下列句子,并将正确答案写在答题卡相应的位置。
All the children _________________ ( 应该 )study hard.
______________ ( ……的数量 )the students in our school is 1400.
_________( 毫无疑问) that it is the most expensive to go by plane.
The room is too noisy, please _____________(调低音量)the radio.
How do you _________( 处理 )the waste water from the factory?