1
Methane is a type of .....
2
Greenhouse gases cause .....
3
We must take care of the .....
4
contamination
5
What\'s the ..... like today? Any forecast?
6
Don\'t drop ..... in the street
7
The city is covered with water. There was a .....
8
It\'s fun throwing flakes in the .....
9
Look at those black clouds, it\'s going to .....
10
Turtles normally lay their eggs on .....
11
Helicopters fly in the .....
12
Fish live in the .....
