a. If / earth / get warmer // sea / get warmer.
If the earth gets waremer, the sea will get warmer. 
b. If / ice / North and South poles / melt // sea level / rise 
If the ice in the North and South poles melts, the sea level will rise. 
c. If / there / floods / many parts / world // many people / lose homes and lands.
If there are floods in many parts of the world, many people will lose homes and lands. 
d. If / people / cut down / trees / forest // there / be / big floods
If people cut down trees in the forest, there will be big floods.

​VI.
1. must
2. can
3. must
5. must
6. may
7. should
8. might

câu 6
1. must
2. can
3. must
5. must
6. may
7. should
8. might