—As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?
—For almost 10 years．
| A．did you study | B．have you studied |
| C．were you studying | D．have you been studying |
We had a marvelous holiday: only the last two days were slightly _____ by the weather.
| A．damaged | B．hurt | C．ruined | D．spoiled |
The book seems to have been _____ from various books and articles.
| A．pieced together | B．taken off |
| C．broken away | D．pulled out |
As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
He left in such a hurry that I _____ had time to thank him.
| A．almost | B．even | C．nearly | D．scarcely |
I broke my relationship with John because he always found _____ with me.
| A．error | B．mistake | C．fault | D．failure |