14.How much money do you__________each week?
A. cost
B. use
C. take
D. spend
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15.The waters of the lake were so__________that it looked like glass.
A. silent
B. calm
C. still
D. quiet
16.This railway__________Shanghai and Beijing.
A. joins
B. ties
C. concerns
D. connects
17.He was afraid of losing his way and made__________on the trees with a knife.
A. symbols
B. words
C. marks
D. signs
18.He__________to see what I meant, though I explained again and again.
A. wondered
B. was unwilling
C. fell
D. failed