n. a sharp pointed object that riders sometimes wear on the heels of their boots and use to encourage their horse to go faster; vt. to encourage sb.to do sth. .or to encourage them to try harder to achieve sth.
A. spray
B. spear
C. spur
D. seal
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vi. to shake slightly because you are cold, frightened, excited, etc.
A. shriek
B. shrink
C. rotten
D. shiver
a. not studying or looking at sth. thoroughly; seeing only what is obvious; appearing to be true, real or important until you look at it more carefully
A. slender
B. superficial
C. sufficient
D. rural
n. a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities
A. smog
B. soil
C. slogan
D. spear
v. to begin sth. again after a pause or an interruption
A. soak
B. renew
C. spill
D. repent