12.how can this hind of special food be cooked by you?
13.an art school may be opened there by us.
14.their homework must be done carefully by students.
15.the time should be cherished by students in the school.
30.the work shouldbe done at once .
31.the wall is going to be painted by us.
35.tom was chose as athe monitor of the class by all the classmates.
字母该大写的大写。
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