Dr. Ma used to            two or three persons in the hospital.

A．operate on        B．operating on       C．operate for        D．operating for

Dr. Ma used to __________in a hospital.

Dr. Ma used to            two or three persons in the hospital.

根据括号中所给的汉语写出单词，使句子意思完整正确。
【小题1】It is said listening to   ▲ (音乐) can make people relax.
【小题2】We should ask more people to go to work by   ▲ (自行车) to reduce the pollution.
【小题3】Tomorrow is my son’s   ▲ (第十五) birthday and I will buy a gift for him.
【小题4】World Expo 2010 Shanghai brings China a bright   ▲  (将来). 
【小题5】Wang Wei is a   ▲ (英雄) and he has been one of the top ten people who moved the Chinese in 2010.
【小题6】Thomas Edison always asked some   ▲ (奇怪的) questions in school.
B) 根据句子意思，用括号中所给单词的适当形式填空。
【小题7】I asked him what his   ▲  (choose) was but he said it was a secret.
【小题8】 In November 2010, the Asian Games took place in Guangzhou, a ▲  (south) city in China.
【小题9】Neil Armstrong had been interested in   ▲  (fly) ever since he took his first flight at six.
【小题10】 Vegetables from Japan may be   ▲  (harm) to our health, so we will not buy them any more.
【小题11】Dr. Ma used to   ▲  (work) in his office, but now he works in a moving hospital.

Dr. Ma used to __________in a hospital.