1. My mother is never free from morning till night.
2. The Nile River is much longer than thr Red one.
3.Both students and teachers can borrow books.
4."You should take more exercise."
5.đúng rồi nè :)
6.Unless we try to save sources of energy, they won't be soon end.
7.Mike doesn't play chess as well as Barbara.
8.I walk to school about 20 minutes.
9.đúng rồi nè :)