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 3.宇航員還未在火星上發現生命跡象。(discover， yet)

2.太陽和它的八顆行星被稱為太陽系。(be called)

2.自從買了電腦以后我就很少鍛煉了。

I             since I got my computer.

 3. The sun is at the heart of the solar system and 8      (行星) go around the sun.

(   ) 5. —Have you ever      to the Movie Theatre?

Yes,I        there with my friends last week.

   A. gone; go   B. been; went

   C.  gone; went

(   ) 7. You haven’t cleaned your bedroom       .

   A. already   B. yet

   C.  ever   D. never

27. —  you      (do) your homework yet?

Not yet. I          (do) it now.

(   ) 6. —How long have you      friends?

—Since ten years ago. I       friends with her ten years ago.

   A. been; made   B. make; made

   C.  been; been   D. made; made