The rising house price and the high income tax rate have become the biggest ______ of the ordinary people in China today．
| A．concern | B．influence | C．involvement | D．occupation |
I want to ________ a question to the chairman but in a moment I lost my nerve.
| A．arrive | B．reply | C．rise | D．raise |
The problem ________ this material can be used in our factory has been solved.
| A．that | B．what | C．whether | D．why |
The first thing ________ I did was to see if there were any products ________ might help me, but there only seemed to be powders ________ to kill snakes.
| A．that; /; designed | B．which; that; designed |
| C．/; that; designed | D．/; which; design |
________ is very important in doing any scientific work.
| A．Album | B．Category | C．Accuracy | D．Assume |
All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.
| A．in need | B．in place | C．in vain | D．in case |