1.Alice hopes that people will not   (pollute, pollution)the Earth.

2.Put the paper into a box. Seal it  (with, in)tape.

3.Perhaps there will not be  (some, enough)food for everybody.

4.Maybe in the future, people will be able to travel to  (other,another)planets.

5. Perhaps people from different countries will speak  (the same, same)language.

6. There is no summer  (or, and)winter on Hainan Island.