Many insects are useful to humans. For example, some farmers put ladybugs on their plants ________ these insects eat insects that destroy crops.

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－It seems that Henry isn't a Frenchman.

－No, he isn't a ________ speaker of French.

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Insects have many different living and eating habits. Some live in hot climates; others ________ cool temperatures. Some eat plants; others eat other insects or dead animals.

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Mrs. Smith locked both the front and the back doors before she went to bed ________ that a thief might steal into the house.

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You might wonder how the hibernating (冬眠) animal ________to live without eating for so many months.

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She held the gold medal, trying to keep back her ________ tears.

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The long walk ________ our will and strength.

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The Chinese are working hard to ________ the gap in science.

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The French pianist who had been praised very highly ________ to be a great disappointment.

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－Should I talk to you in English or French?

－Do as you ________. We understand both.

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