1, If we don't use the car all the time, we will not make the air dirty
2, Toan is the shortest in our class
3, Lan began learning English 5 years ago
4, I like reading books and I don't like watching films
5, Don't swim in that polluted lake, boys
6, My future house might be on the moon
7, I saw that movie last year
8, Don't talk during the meeting
9, If we recycle more, we will save a lot of materials
10, The Nile is the longest river in the world