Choose the best option:

During a long drought, farmers had to find ways to ____ their crops.

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• The development of professional sports in the United Stated dates back to nineteenth century.

• Mutualism is a relationship between animal species which in both benefit.

• Choose the correct answer to complete the sentence. " In the process of _______ certain kinds of fruits, sulphur fumes help maintain their color"

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• No one is in this room now, _    ? 

• There are many ways to preserve fruit, for example freezing, canning and to dry

• No matter what different, various music types have one thing in common: touching the hearts of the listeners.

• Compose Richard Rodgers and lyricist Oscar Hammerstei II brought to the musical Oklahoma extensive musical and theatrical backgrounds as well as familiar with the traditional forms of operetta and musical comedy.

• In his famous domes, architecture Buckminster Fuller utilized thousands of simple equilateral triangles linked together.

• .................gold is perhaps .............. most highly treasured metal. A. the / X B. X / the C. the / the D. X / X

• The Gray Wolf, a species reintroduced into their native habitat in Yellowstone National Park, has begun to breed naturally there.

• When he arrived at the furniture shop, they had been sold the table he wanted.

• If the world's tropical forests continue to disappear at their present rate, many animal species ____________ extinct. 

• Established about 1300, the Acoma Pucblo in New Mexico is believed to be oldest continuously occupied settlement in the United States.

• Had we known the traffic would be so bad, we did not drive back from work so early.

• “How does the human brain work?” remains one of the most profound questions confront modern Science.

• With an annual income of fifty thousand dollars a year, he can afford to give a luxurious life.

• A thunder usually follows lightning by five seconds for every mile between the flash and the observer.

• To survive , most birds must eat at least half their own weigh in food every day

• Forgetting something usually mean an inability to retrieve the material that is still stored somewhere in the memory.

• Learners can feel very ...... if an exercise is too difficult.