根据句子意思,用所给单词的适当形式填空.

题目

根据句子意思,用所给单词的适当形式填空.
81.I saw three_(ambulance) outside the hospital.
82.Whenever she makes decisions,her family always comes _ .(one)
83.The speaker went_ (straight) towards the high building.
84.With Tom's help.Bob does his homework__ (careful) than he did before.
85.We can tell good from bad by _ (compare).
86.The story _ is interesting,but it's a little difficult for children.(its)
87.On _ (mother) Day,I always send flowers to my mother.
88.There is someone _(knock) at the door.Go and see who it is.
89.Nothing is impossible,_（be）it?
90.Teachers complain that the freshmen are _(prepare) to do college-level work.

答案

81.I saw three ambulances / ambulancemen outside the hospital.
82.Whenever she makes decisions,her family always comes first
83.The speaker went straighttowards the high building.
84.With Tom's help.Bob does his homework more carefully than he did before.
85.We can tell good from bad by comparison.
86.The story itself is interesting,but it's a little difficult for children.
87.On Mothers' Day,I always send flowers to my mother.
88.There is someone knocking at the door.Go and see who it is.
89.Nothing is impossible,is it?
90.Teachers complain that the freshmen are ill-prepared to do college-level work.