() 7. on Mars have to wear special boots themselves heavier.

   A. Human;to make   B. Humans;to make

   C. Human;make. D. Humans;making

() 6. — Will the journey to Mars be?

—No,I think it will be.

   A. enjoy;frightened   B. enjoyable;frightened

   C. enjoy;frightening   D. enjoyable;frightening

() 5. of the coats made of cotton. They feel comfortable.

   A. Twothirds;is   B. Twothirds;are   C. Twothird;is   D. Twothird;are

() 4. Joanna is what life will be like in fifty years.

   A. thinking   B. think of   C. thinking about   D. think over

() 3. The supermarket becomes at weekends than on weekdays.

   A. crowd   B. crowded   C. crowdeder   D. more crowded

() 2. I think it is not good to have my parents everything for me.

   A. do   B. done   C. not do   D. doing

() 1. We all know that plants can oxygen.

   A. produce   B. want   C. need   D. develop

10. (science) are working hard to make the dream come true.

9.(compare) with schools in the countryside,schools in the city are better in many ways.

8. You can (easy) jump very high if you wear this pair of boots.