【2012重庆卷】It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa
| A．when | B．that | C．after | D．since |
With the loss of labor，the old farmers ________at home had to choose less labourintensive crops.
| A．left | B．to leave |
| C．having left | D．leaving |
--- This afternoon let’s go to a good restaurant.
--- it will cost a lot of money.
--- Don’t worry. It is my _______ today.
| A．service | B．offer |
| C．turn | D．treat |
Mr Wang devoted all his time to_______ his spoken English before going abroad.
| A．improve | B．being improved |
| C．improved | D．improving |
We must speak English __________ in order to improve our oral English.
| A．actually | B．gradually |
| C．frequently | D．entirely |
She is an excellent student in our class, and she always ________ herself in her studies.
| A．hides | B．buries |
| C．covers | D．leaves |