Please tell me how the accident _____. I am still in the dark.
| A．came over | B．came across | C．came about | D．came out |
You should make it a rule to leave things _______ you can find them again.
| A．when | B．where |
| C．in which | D．there |
For many cities in China, there is no room to spread out further, _______ Yangzhou is an example.
| A．for which | B．in which |
| C．of which | D．from which |
The artist made up his mind to devote all he could his English before going abroad.
| A．improve | B．to improve |
| C．to improving | D．improving |
A new ________ bus service to Yangzhou-taizhou Airport started to operate two months ago.
| A．normal | B．usual |
| C．regular | D．common |
Doctor Wang, who ____ western medicine for six years in New York, is now working in a famous hospital in Shanghai.
| A．had studied | B．studied |
| C．has studied | D．is studying |