18.The actual cost of printing the book was much higher than his (earlier) estimate.选择能代替括号里的选项
A.essential
B.potential
C.substantial
D.initial
满分：4 分
19.He is eager to win because his enjoyment of a game lies in the struggle to defeat his____.
A.enemies
B.opposites
C.opponent
D.friends
满分：4 分
20.The task has been (laid down) on me by very unfortunate circumstances,but I must perform it as well as I can.选择能代替括号里的选项
A.given
B.imposed
C.offered
D.assigned
满分：4 分
21.For a long time scientists have suspected that life exists on other ____ besides the earth.
A.planes
B.plains
C.planets
D.plants
满分：4 分
22.The （foundation） was not firm enough to support the weight of the apartment house.选择能代替括号里的选项
A.root
B.basis
C.basic part
D.substructure
满分：4 分
23.If Henry had not pull his cap low over his brow,he ___ by the police.
A.might be recognized
B.might have been recognized
C.would have recognized
D.was to have been recognized
满分：4 分
24.Parents sometimes （do harm） to their children,not by teaching them too little but by trying to teach them too much选择能代替括号里的选项
A.influence
B.afford
C.injure
D.affect
满分：4 分
25.Great changes _____ in Beijing in the past three years.
A.took place
B.have taken place
C.has taken place
D.have been taken place