35. Active: They were decorating the room when I came.
Passive:
A. The room were being decorated when I came.
B. The room was been decorated when I came.
C. The room had been decorated when I came.
D. The room was being decorated when I came.
IV. READING:
@. Choose the letter (A,B,C, or D) to complete the following passage:
Many cities have a serious pollution problem. Motor vehicles, factories, and other
...(36)... create so much air pollution that it may hang in the air like dirty ...
(37)... . Air pollution ...(38)... the health of the people who live in cities.
City ...(39)... cause water pollution when they are poured into waterways.
These wastes ...(40)... fish and make some areas unfit for swimming. In
addition, many large ...(41)... have difficulty in disposing of their garbage. The
amount of ...(42)... grows each year, but places to put it are filling up.
Citizens, government, industries, scientists, and business people must work together to
gradually reduce ...(43)... . For example, most cities have introduced recycling
programs, which ...(44)... on garbage and the space needed to store it. Residents
separate recyclable products from garbage, and city governments provide drop-off sites or
pick up the products ...(45)... homes.
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