We must try our best to the river being polluted any more.
| A．separate | B．keep | C．prevent | D．guard |
Eugene's never willing to alter any of his opinions, so it's no use __________ with him.
| A．to argue | B．arguing |
| C．argued | D．having argued |
Big companies generally __________ the plan, while small ones don't like it at all.
| A．approve of | B．argue about |
| C．accuse of | D．appeal to |
Gun control is a subject __________ Americans have argued for a long time.
| A．of which | B．with which |
| C．into which | D．about which |
-Mum, I have been admitted into Hong Kong University. -Well done! __________.
| A．Take it easy | B．I'm not sure |
| C．I'm so proud of you | D．Wish you luck |
Mark Twain's vivid and often amusing descriptions quickly established the __________ he still enjoys today as one of America's greatest writers.
| A．character | B．fortune |
| C．reputation | D．invention |