Carl Linnaeus made great contributions to ________ plant species.
| A．group | B．have grouped | C．grouping | D．been grouping |
The pregnant woman always sits in the nonsmoking area of restaurants to reduce her exposure ________ smoke.
| A．to | B．with | C．in | D．from |
My visit to your school is really an unforgettable experience, ________ I will treasure for ever.
| A．that | B．one | C．it | D．what |
________ giving a general introduction to computers, the course also provides practical operation.
| A．In terms of | B．In addition to |
| C．In case of | D．In order to |
That coat fits me, but I can't afford to buy ________. I have to choose ________ that is cheap enough for me.
| A．one; that | B．that; it |
| C．it; one | D．it; the one |
Difficult conditions will sometimes ________ a man's best qualities.
| A．give out | B．bring out |
| C．let out | D．take out |