六、语法填空。
Here is a page from a magazine called Future. Read the following information about things that may happen 29. ______ ten years.
Cars will run on solar energy and will be much 30. ______ (clean). They will move more quickly and they will be much safer. People will build some new 31. ______ (city) in the sea. Some of 32. ______ (they) will have two levels. People will live on the first level, 33. ______ shops, banks and factories will be on the second level. It's amazing to live under 34. ______ sea, right? It takes people some time 35. ______ (develop) biotechnology（生物技术）to make food healthier. And people will keep food fresh for a longer time 36. ______ (easy). And space travel 37. ______ (cost) less money in the future.
38. ______ else do you want scientists to invent? Please share your thoughts with me.

in
; cleaner
; cities
; them
; and
; the
; to develop
; easily
; will cost
; What