He works as an engineer now, but he _____ on a farm for three years.
| A．has worked | B．worked | C．was working | D．had worked |
_____ holiday, my family will go to Shanghai to visit the World Expo.
| A．To talk of | B．Talk of | C．Talking of | D．Talked o |
Everyone in our school is working hard and doing what we can _____ a good college.
| A．enter | B．to enter | C．entering | D．entered |
If _____, please buy me a backpack while you are at the supermarket.
| A．you are convenient | B．it is convenient to you |
| C．it is convenient with you | D．I am convenient to you |
Most of the countries in the world hold the belief _____ Taiwan is inalienable part of the People’s Republic of China.
| A．whether | B．which | C．what | D．that |
. My mother was against my idea while my father was _____ it.
| A．in need of | B．in favor of | C．in front of | D．in research of |