Question

Answer 1

III

1 Because Lan had a bad cold, she didn't go to school yesterday

2 Although Lan can sing very well, she can't play the piano

3 We have became close friend for a long time

IV

1 If we plant more trees, our neighborhood will be greener

2 If we cycle to school everyday, we will keep the air clean and fresh

3 If we keep hunting animals, they will disappear soon

4 If we cut down all the trees, there will be floods

5 If we use buses, we will reduce pollution

6 If he doesn't eat breakfast, he will be hungry

7 We can reuse bottles and can