Have you ever tried the Magic Cube (魔方) ”？Pick up one of these cubes and you probably won’t be able to P l  it down. How hard can it be to rearrange the nine little s 2   on each side of the cube? In

fact,there are millions of possibilities!It has been over 40 years since the cube first h 3   the market. However,not many people know that it was used just as a simple classroom m 4   in the beginning.

    In 1974,Erno Rubik i 5  the “Magic Cube” as he called it. He did this to help his students u 6  difficult 3-D concepts (概念). This classroom example was quickly t 7   into a popular toy. In 1979,Ideal Toys started to sell it as “Rubik's Cube”. The invention quickly became a c 8   icon in the 1980s.

    As time went by,the cube once 1 9  its attractive qualities. However,it made a comeback with the Internet. Now anyone can go online and find many videos that show ways to s 10   the cube. 

l.   2.   3.   4.   5.  

6.  7.  8.   9.   10.  

5. We hope we can organize a trip to Green Hill.(改为简单句)

We hope     to Green Hill.

4. Is tea grown in South China?(改为主动语态) 

  people  tea in South OHina?

3. The teacher made the students copy the text.(改为被动语态) The students were   copy the text by the teacher.

2. People use keyboards for typing.(改为被动语态) 

Keyboards    typing by people.

1 My dad repaired the broken bike last night.(改为被动语态) The broken bike by my dad last night.

() 6. (2015 •凉山) —Are you going to Sam's birthday party the day after tomorrow?

—I'm not sure. I will go with you if I .

   A. will invite   B. invite   C. will be invited   D. am invited

() 5. A lot of trees  around here every year and we can enjoy fresh air now.

   A. plant   B. is planted   C. were planted   D. are planted

() 4. (2015 •天津) The novel  by many people today.

 A. is read  B.are read  C. reads   D. were read

() 3. Why did you go to bed so late last night?

—Because my homework  on time.

   A. is finishing   B. wasn’t finished   C. isn’t finished   D. finishes