If we had taken such effective measures much earlier, the fiver so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
274. The bad-tempered man ignored his neighbor's requests that he _____ less noise.
| A．make | B．made | C．making | D．Makes |
273. Hearing that song always ______ the educated urban youths once working in the countryside(下乡知识青年) _____ the life in the country.
| A．reminds …of | B．remind … of | C．reminded … that | D．reminds … That |
272. Because of the role he played in freeing the African-American from slavery, Abraham Lincoln is ______ as one of the _______ of all American presidents .
| A．thought … great | B．thought … greatest |
| C．regarded … great | D．regarded … greatest |
271. Wait for me for a few more minutes. I am _____ to a letter from one of my former classmates at college and will finish writing very soon.
| A．replying | B．answering to | C．replying to | D．answering for |
270. Hoping that they would ______ the rent a little, we pointed out all of the flaws in the apartment.
| A．reduced | B．reduce | C．increase | D．Fell |