1. What ...does.... he  ....do...... ?

He ..is watering .... flowers in the garden.

2. In the summer, I usually go  to the park with my friends, and in the spring, We have Tet holiday; I am happy because I always visit my grandparents.

3.How .does....... your sister  ...go... to school?

4. What .do..... they ....do.... in the winter?

1. singer

2. teeth

3. farmer

4. noisy

5. children

6. dangerous

7. watching

1.A. will 

2.A. become

3 . D. a lot

4 . B . polluted

5. A . with

Child

1. If we recycle bottles and cans , we will help the environment

2. What are you going to do this weekend?

3. I will have a hi-tech fridge that can cook means

4. We visited our grandparents in the countryside last week

Students is take part in different activities at recess

we live near nam's house, but we don't see him very often

Ta có x + y = 0 => y = -x

=> C = 2x³ - x(-x)² + (-x)³ - 2

        = 2x³ - x³ -x³ - 2

        = -2