1.市场是商品经济的产物,哪里有商品 和 ,哪里就会有市场。
The police have taken every security measure to __________ the jewellry shops from being robbed.
A. preserve
B. pretend
C. prevent
D. promise
He has an open__________ on the subject, so you cold easily persuade him.
A. mind
B. brain
C. sense
D. head