【正文】
uman) have the ability to make Mars a good home. crowded humans 5. NASA has a plan to make more _______(spacecraft) in the future. 6. You must __________ (fix) to the wall when you are in space if you don’t want to float away. spacecraft be fixed 7. This strange thing is used for __________ (provide) the space shuttle with energy. 8. I think a camera is the __________ (little) important of the three. Who needs it? providing least 9. A __________ (sleep) bag is necessary when you are in a tent. 10. We need a puter __________ (connect) to the interpla work when we are on Mars. sleeping connected 比一比 , 看誰最快 ! Bye! Thank you !