________ such heavy pollution already it may now be too late to clean up the river.

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Many difficulties have ________ as a result of the change over to a new type of fuel.

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When I passed the entrance examination, my family ________ me ________ my successes.

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Choose the best answer which can complete the sentence.

They've invited me to their party, ________ is kind of them.

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Choose the best answer which can complete the sentence.

Crusoe's dog became ill and died, ________ made him very lonely.

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Choose the best answer which can complete the sentence.

I often thought of my childhood, ________ I lived on a farm.

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My mind wasn’t on what he was saying so I’m afraid I ________ half of it.

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Choose the best answer which can complete the sentence.

Next month, ________ you'll spend in your hometown is coming.

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Choose the best answer which can complete the sentence.

There is no dictionary ________ you can find everything.

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Choose the best answer which can complete the sentence.

His uncle works in a factory ________ bicycles are made.

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