No river in the world is longer the Nile

part 1

1 In the future, robots might behave like humans

2 What is the longest river in Viet Nam?

3 Air pollution causes breathing problems

4 Turn off the tap When you are brushing your teeth

part 2

1 The Nile is the longest river in the world

2 Don't swim in that polluted lake

3 No student in his class is taller Ba

4 If you don't turn of the light before leaving, you will waste a lot of electric

part 3

1 If we recycle paper, we will save a lot of trees

2 What is the hottest desert in the world?