I.

1. Why don't you clear up the garbage before leaving, Lish suggested that Mit should.
2. We haven't used these machines for a long time. It's been a while since we used these machines.
3. Thu is the best tennis player in the club. No-one else in the club can match her skills.
4. It's a pity they are travelling on uncomfortable buses. They wish they were traveling on comfortable buses.
5. They grow more. They will become more independent. The more they grow, the more independent they will become.

II. 
1. I couldn't apply for that job because I didn't know English.
2. Why shouldn't we use electricity economically?
3. It is said that she is the best singer in the world. She is rumored to be the best singer in the world.
4. No matter how wealthy she is, she is not happy.
5. I would rather you not make noise in the class.