ow was now two feet deep, making it difficult,if not impossible, _______ the car out.

Please never do such things _______ other people.

21． More than one high official_____by the police since the mayor war shot dead.

Before a problem can be solved, it must be obvious _____ the problem itself is. [ ]

Students are asked to _____ themselves inthis boarding school and they are only allowed to go back home once a week.