`II`
1. If my mother eat less fast food, she may lose weight.
2. You should brush your teeth regularly if you don't want a toothache.
3. Lake Baikal the deepest lake in the world.
`III`
1. peak season
2. Check in
3. Bus stop
4. pile-up
5. full board
6. touch down
(bài này e ko chắc chắn nhé)