28.The number of the students in our school　 ______ about eight hundred.

A. are　 B. were　 C. is　 D. be

27.Sandy was too nervous　 ______ the teacher’s question.

A. answer　 B. to answer　 C. answering　 D. answers

26.Life on Mars will be better than life on Earth ______ many ways.

A. on　 B. in　 C. at　　 D. for

25. They will ________(大概) give us the correct answers.

24. On October 12th,2005, two ________(宇航员) went into space by Shenzhou VI.

23. There are nine ________(行星)in the universe.

22. Before the Project of Sanxia, many ________ (移民)left their hometown.

21. People must wear space________(宇航帽) to go outside on Mars.

15．电子狗___________________　　　 20.space food___________________

14．飘走___________________　　　　 19. power pack___________________