I understand ______ preparation that staff must put in under pressure to meet the deadline.

I began to fish before memory began, _______ I know I have always fished.

A. so far B. so as far as C. as far as D. so

It is thought that one billion people I the world, ______is half the word’s workers, earn their living by farming.

A. if B. that C. which D. what

I should like to try that coat on, but I don t know if it is my ____.

A. length B. measure C.size D. pattern

—The experiment is of particular importance.

　　　　—I see. We will carry on with it ________ we can get enough money.

　　A. unless　　　　B. though　　　　C. whether　　　　D. until

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