1.Tom considers the air tank more important than dry food,while I value the latter more;
2.It's difficult to walk on the surface of a planet.
3.A air tank allows the astronauts necessary air to breathe for several hours
4.Space sleeping bags are fixed on the wall to avoid drifting away
5.Energy pack provides energy for penguin suit
6."May" is used in the situation with a stranger
7.Scientists believe that there will be more spare time for interests in the future
8.Could you tell me whether the gravity on the moon is one sixth of that on the earth?
9.Astronauts should wear a helmet attached to the air tank.
10.These plants could produce the food、water and oxygen we need.