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13. Solar energy heating system is an _____ method of heating.

  A. economic           B. economy         C. economics    D. economical

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12.  ---- I’ve put my name down for the expedition trip to Antarctica.

   -----_________.

   A. Is that all?                  B. That’s all right.

C. I believe what you said.              D. Are you serious?

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11. _______ there was no conclusive evidence, most people thought he was guilty.

   A. When            B. As far as       C. As long as      D. While

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10. ________ I call on him, he is out.

A. The moment                      B. So far as  

C. Every time                      D. Any time

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9. If you stand here, you'll get a better ________ of the river.

A. sight         B. view       C. scene           D. scenery

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8. ______ in the regulations that you should not tell other people the password of your e-mail account.

   A. What is required                  B. What requires  

   C. It is required                        D. It requires

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7.When Captain Bligh arrived in Tahiti, it became clear that it would be some months ______ the breadfruit trees were ripe and ready to be taken to the West Indies.

  A. that           B. before            C. since            D. then

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6.By sunset we had _________ thirty miles.

  A. advanced          B. covered             C. charged           D. marched

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5. The film “A World without Thieves” _______ a great success and brought in a large profit to the cinema.

  A. appreciated          B. enjoyed            C. won           D. seized

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4. By the time Jane gets home, her aunt________ for London to attend a meeting.

  A. will leave           B. leaves           C. will have left         D. left

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