These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on．
| A．would have been unthinkable | B．would not be unthinkable |
| C．would be unthinkable | D．would not have been unthinkable |
In his lecture, the professor referred to the belief, in contrast to all other countries, ______ the elderly are wise, ______ is particularly dominant （占优势的） in the Chinese culture．
| A．that; that | B．that; one that | C．which; which | D． that; one |
--- I saw your uncle take a taxi to the airport. Why didn’t you drive him there?
--- I ______. But my car ______.
| A．would; was fixed | B．would have; was fixed |
| C．would have; was being fixed | D．did; was being fixed |
I will be surprised if you can get Calvin, who is very mean, ______ these donation draw tickets from you．
| A．buy | B．buying | C．buys | D．to buy |
As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.
| A．exactly | B．finally | C．gradually | D．frequently |
Many students listened to the lecture, but I wondered how much they ______.
| A．took out | B．took up | C．took off | D．took in |