【小题1】Many people don’t understand the           of learning English well.（重要性）
【小题2】The bag is just for one of the          （旅游者）
【小题3】        ,he didn’t pass the driving test.（幸运）
【小题4】This kind of the tree only grows in the          part of China.（南方）
【小题5】They have       they will take action to reduce the pollution.(意识)
【小题6】Their teacher’s          at the party made them very happy. (arrive)
【小题7】There are eight people in the room,          the two women.(include)
【小题8】It was much         in London in the past.(fog)
【小题9】Sometimes bad weather causes           disasters.(nature)
【小题10】He found it       to watch such a bad match.(bore)

Rita and Anna have finished their homework, ______?

   A. have they   B. haven’t they  C. didn’t they

---Look, what have they done?

   ---Sorry. I think if I __________ another chance, I’ll do it better.

A. give     B. will be given        C. will give        D. am given

—Have they finished the work?

  —Not         .

A.just                                              B.yet                            C.ever                                   D.already

Scientists think that there has been life for__31_ of years. However we haven’t found life on other planets _32_ . The earth is a planet and it _33__ around the sun. Seven other planets also go _34_ the sun. The sun and its planets are __35  the solar system. The solar system is a small part of our galaxy.

Scientists __36_ lots of spacecraft to look at other planets in the solar system, and some spacecraft have gone __37_ the solar system. However, no one __38_ any life in space yet.

But why has no one from other planets sent us a message ? Have they tried to send _39_ to us ? _40_so many stars in the universe, are we alone, or is there life out there in space ? We don’t know.