Experts warn that medical waste from hospitals, if properly, may contribute to spreading diseases．
| A．not handled | B．not being handled |
| C．not to be handled | D．not having been handled |
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 |
—I want to go to the library but I am afraid I am not in the right ________.
— _________. Go ahead.
| A．way; No | B．distance; No |
| C．side; Yes | D．direction; Yes |