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23. It won’t be long before such a thing _____ again.

  A. happened       B. is happened        C. will happen        D. happens

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22. The key to my door _____. I have looked for it everywhere, but I still _____ it.

A. is missing; can’t find                 B. has lost; don’t find

C. has lost; haven’t found               D. has been gone; haven’t found

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21. I don’t think Jim saw me, he _____ into space.

  A. just stared       B. was just staring     C. has just stared     D. had just stared

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20. Don’t interrupt me . I ___ letters all morning and have written five.

A. write          B. have written       C. was writing       D. have been writing

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19. So far solar energy ___ in the world.

A. has not been widely used              B. is not widely used 

C. was not widely used                   D. hasn’t used widely

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18. It ___ every day so far this month.

A. is raining       B. rained           C. rains            D. has rained

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17. My pen ___ for two weeks. May I borrow yours, please?

A. has lost         B. had lost          C. had been lost          D. has been lost

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16. You look worried. What ____ to you?

A. happens        B. has happened      C. happened         D. is happening

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15. -Do you know our town at all?

-No. This is the first time I ___ here.

A. was           B. have been         C. come            D. was coming

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14. The pen I ___ I ___ is on my desk, right under my nose.

A. think; lost       B. thought; had lost    C. think; had lost          D. thought; have lost

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