Mars is the fourth planet from the sun and is commonly known as the Red Planets. The rocks, soil and sky
of it are a little red or pink. Its name was given by the Romans in honor of their god of war.
        People on the earth need oxygen to breathe. There is almost no oxygen on Mars. Living on Mars would be
like living on a very high mountain. There would be little air. It might be 50 degrees above zero at noon and 100
degrees below zero at night. We know that Mars has carbon. Through a telescope, Mars looks red. In some
places, it seems gray. At times the gray turns gray-green, then brown, then gray again. The gray-green may be
a kind of plant color which changes with the seasons.
        Life is expected on Mars by scientists, because there are distinct seasons on the planet's surface. This
condition might support plants. However, some researches find if Mars had life, it must have been a long time
ago. For Mars' first 600 millions years, it had plenty of water and proper temperatures for life. But now the
planet's environment has changed. Mars is not a pleasant place for any form of life.
1. 根据解释，在短文中找出相应的单词或短语。
    ______: famous        ______: sometimes
2. Its name was given by the Romans in honor of their god of war.
(改为主动语态的句子) __________________________________________________________________
3. Why is life expected on Mars by scientists?
(回答问题) __________________________________________________________________
4. There is almost no oxygen on Mars.
(改为反意疑问句) There is almost no oxygen on Mars, _____ _____?
5. But now the planet's environment has changed. Mars is not a pleasant place for any form of life.
(翻译成汉语) __________________________________________________________________

1. There isn't anything in the bag. (改为同义句)
    There                          in the bag.
2. We can see a lot of sheep in the photo. (对划线部分提问) 
                               sheep can you see in the photo.
3. It's only ten minutes from my home to school by bicycle. (改为同义句)
    It             only ten minutes to              to school from my home.
4. That postcard is mine. (改为同义句)
    That postcard                                        .
5. Lesson 20 is not easy. (改为同义句)
    _______  _______  _______ is not easy.
6. Which is your favourite restaurant? (改为同义句)
    Which restaurant do you                           ?
7. The building has 12 floors. ( 改为同义句) 
                               12 floors in the building.
8. That sounds great. (对划线部分提问) 
                               that sound?
9. My brother and I live in the same room. (改为同义句)
    I              a bedroom              my brother.

1. This story is more interesting than that one.  (写出相应的选择疑问句)
    Which story is _____  _____  , _____ _____ or _____ _____  ?
2. Over 10 students are cleaning the classroom.  (改为同义句)
     _____  10 students are cleaning the classroom.
3. Miss Wang is the most popular of all the teachers. (改为同义句)
    Miss Wang is_____  _____   than _____  _____  teacher.
4. I think you are right. (改为否定句)
    I _____  _____  you are right.
5. Fish can't live if there is no water.  (改为同义句)
    Fish can't live_____  water.

1. Many fast food restaurants have red walls because it can make customers eat faster.(对划线部分提问)
                                  many fast food restaurants have red walls？
2. The ads made him a little happy.(改为同义句)
    The ads made him              happy.
3. I really don't know which one to buy.(改为同义句)
    I really don't know which one I_______ _______.
4. The teacher said, "Give me your homework."(改为间接宾语)
    The teacher _______               to give him my homework.
5. The seats in that theatre are so hard that I want to leave soon．(改为too…to结构)
    The seats in that theatre are _______hard for me               any longer.