1.掌握can, could, may, might 四个情态动词在表示请求时的用法。

25.Food will be in the form of pills.

24.We will be cared for by robots.

23.Robots could be the first to live on Mars.机器人可能是第一批生活在火星上的(人)。

22.She’s too nervous to relax.

21.Things from Earth are hard to find.= It is hard to find thing from Earth.　　

20.A very popular form of entertainment is online games.

19.The surface of Mars is more like the surface of Earth than any other planet in our solar system.

18.It takes Mars about two years to revolve completely around the sun.

16.It worries me.

　 ★17. It would be great to have robots do all the work for us.