I

1. a lot of trees are going to be planted in the school yard

2. if i had enough money, i could buy this motorbike

3. in spite of being tired, they tried to....

4. my friends told me that they might go sightseeing in sapa the following week

5. because his room is untidy, his mother....

II

1. how about giving a presentation about water and air pollution 

2. there is plentiful water for life on earth 

3. by the time i started primary school, i had learnt how to ride a bike 

4. we've decided to stay in HCM city for 3 days

5. scientists are planning to send people to explore mars ( sao hỏa ) in the near future

III

1. i'm living on an outskirts in a city in VN now

2. english is spoken all over the world

3. kangaroo is symbol of australia 

4. lena enjoys chatting on the phone with her friends

5. nick will not be able to go to the cinema at 2:30 PM this saturday because he will be having class