He wants to buy three ______.
A. knifes
B. knives
C. knifees
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The two girls are from two different ______.
A. families
B. familys
C. familyes
Do you know the two young ______ in the picture?
A. men
B. mens
C. menes
People in these ______ speak English.
A. countrys
B. countryes
C. countries
认为通货膨胀完全是一种货币现象是()的观点。
A. 凯恩斯主义
B. 后凯恩斯学派
C. 货币主义学派
D. 马克思主义