Actually, Pluto is not a planet.
1.
1. better - сравнительная степень
2. the longest - превосходная степень
3. the most important - превосходная степень
2.
1. must
2. can`t
3. may
3.
1. wirtes (Present Simple)
2. will leave (Future Simple)
3. doesn`t like (Present Simple)
1.on
2.in
3.in
4.at
5.to
6.At
7.to
8.in front of
9.with
10.for
1. was driving
2. did
3.did
4. was you doing
5. went