Recently, there is ____ boom（繁荣）in population mobility and according to ____ national population survey of 2004, 17 percent of the population move every year.
| A．the; a | B．a; the | C．/; a | D．the;/ |
Maria has written two novels, both of ___ have been made into television series.
| A．them | B．that | C．which | D．what |
—I wonder if you could go with me to the supermarket.
—Sorry. I _______ my experiment report all the morning and haven’t finished yet.
| A．write | B．was writing |
| C．have written | D．have been writing |
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
| A．While | B．Unless | C．When | D．Because |
This morning I saw an old friend of mine in the street by ______.
| A．event | B．accident | C．affair | D．matter |
Everyone should _______________ the environment.
| A．make a contribution to protect | B．make contribution to protecting |
| C．contribute in protecting | D．make contributions to protecting |