"MAY I TAKE YOUR ORDER NOW, SIR

Câu 22: aiter: "May I take your order now, sir?" - Mr. Smith: "________."

A. Sure, it's delicious. B. Thanks, I've really had enough.

C. Ok, here is my bill. D. Yes, I'd like some fishes and chips.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the

correct answer to each of the questions from.

search for alternative sources of energy has led in various directions. Many communities are burning

garbage and other biological waste products to produce electricity- Converting waste products to gases

or oil is also an efficient way to dispose of wastes.

Experimental work is being done to derive synthetic fuels from coal, oil shale, and coal tars. But to

date, that process has proven expensive. Other experiments are underway to harness power with giant

windmills. Geothermal power is also being tested.

Some experts expect utility companies to revive hydroelectric power derived from streams and

rivers. Fifty years ago hydroelectric power provided one third of the electricity used in the United

States, but today it supplies only 4 percent. The oceans are another potential source of energy.

Scientists are studying ways to convert the energy of ocean currents, tides, and waves to electricity.

Experiments are also underway to make use of temperature differences in ocean water to produce

energy.