The athlete seldom wears anything other than sportswear ______the season is.
| A．wherever | B．whenever | C．however | D．whatever |
Before he went abroad, he spent as much time as he ____ English.
| A．could learning | B．learned | C．to learn | D．could learn |
Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.
| A．improve | B．to improve | C．improving | D．to improving |
It was quite a serious accident, _________ caused by careless driving.
| A．which I think was | B．I think which was |
| C．which I think it was | D．I think which it was |
Jane was disappointed that most of the guests______ when she_______at the party.
| A．left; had arrived | B．left; arrived |
| C．had left; had arrived | D．had left; arrived |
The politician has been warned that he would be getting into great trouble ________stick to his standpoint.
| A．were he to | B．he will | C．he was to | D．would he |