21.Jack is a good friend _____,he often comes to our home fo

21.Jack is a good friend _____,he often comes to our home for a visit.
A.of my father B.of my father's C.for my father D.with my father
22.What way are you thinking of _____ rid of the flies?
A.to get B.getting C.being got D.to be getting
23.We must do something to _____ factories _____waste water into the river before it is cleaned.
A.stop; pouring .B.prevent; to pour C.keep; pouring D.stop; to pour
24."_____ of them are not here." means "_____ of them are not here."
A.All; Some B.Both; Every C.Both; Neither D.All; Both
25.--How did you do in the test?
--Not so well.I _____ much better but I misread the directions for Part D.
A.could do B.could have done C.must have done D.should do
26.Mary cares about clothes too much,and she _____ too much money _____ clothes.
A.spend; in B.cost; at C.pays; to D.spends; on
27.Our kind teacher wanted to teach us _____ he knew athis lesson.
A.that B.all what C.that all D.everything which
28.They started early that morning in order that they_____ there before noon.
A.would get B.got C.must get D.might get
29.Is this research center _____ the foreign guests visited last week?
A.that B.which C.where D.the one
30.--What is the model plane look like?--Well,the wings of the plane are _____ of its body.
A.more than the length twice B.twice more than the length
C.more than twice the length D.more twice than the length
麻烦清楚一点,会重赏.

a friend of sb's 某人的朋友
a the way to do sth 固定用法
a stop doing 阻止做某事 keep doing 保持一直做某事
c both 表示两者 all 表示三者 neither 两者
b could have done 表示本应该做 表遗憾
d spend ……on 固定用法
b 我个人认为这个句子是不是有一点点错误……
d 可能
d 与visit 搭配
c 倍数+the+尺寸+of 表示什么是什么的几倍