*More ex

I

1.They enjoy to stay on a farm during the summer vacation

2.We will live happier and healthier life if we keep our environment clean

3.We shouldn't throw the rubbish on the street

4.The students in our school often collect waste paper for their mini project

II

1.They plan make this beach a clean and beautiful place again

2.The students have collected old clothes for their charity programme last week

3.If we use the car all the time , we will make the air dirty

4.Unless I leave , I will miss my train

5.If I don't have a quiet room , I won't be able to do everything

1. They plan to make this beach a clean and beautiful place again.

2. The students have collected old clothes for their charity program for a week

3. If we use the car all the time, we woudl makae air dirty

4. Unless i leave, l will mis my train

1. If we recycled paper, we will save many trees 

1. If people recycle materials, they will save energy

2. Don't throw rubbish on the street

3. Toan is the tallest student in his class

4. It is the first time l have eaten this food