The doctor suggests that a pemon________exercises every day if he wishes tobe healthy．
A. does
B. did
C. do
D. will do
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We wi]l not go to the party_________We are politely invited．
A. if
B. however
C. whether
D. unless
The very core of marketing lies in________.
A. all understanding of consumer needs
B. the efficient movement of goods
C. developing new wants for consumer goods
D. making goods readily available to customers
反映一定时期内全部劳动力资源的实际利用情况，研究国家基本国情国力的重要指标是（）。
A. 就业人员数量
B. 城市家庭人口
C. 就业分布
D. 城镇登记失业率
答案为：
A. ten—minute
B. ten minutes
C. ten minute
D. ten-minutes
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