I/
1. can rain $\to$ rains
2. stop $\to$ to stop
3. do $\to$ does
II/
1. beautifully
2. environmental
3. entertainment
III/
1. I haven't eaten this food since 2010.
2. Mai wishes she knew a lot of students in her class.
3. English is spoken all over the world.
4. Mr. Brown asked me if I could play the guitar.