IV/

15.We go to the dentist twice a year

16. We should brush our teeth with a toothbrush and fluoride tooth paste at least twice a day – once after breakfast and once before we go to bed

17. We can also use wooden toothpicks to clean between our teeth after a meal.

18.It is milk, cheese, fish, potatoes, red rice, raw vegetables and fresh fruit.

19.Chocolate , sweets ,biscuits and cakes

VI/

20.She is very hard-working but her brother is lazy.

21.My mother always does the grocery shopping.

22.We often watch TV after dinner.

23.The students usually do their homework.

IV. Read and answer these following questions.
HOW CAN WE KEEP OUR TEETH HEALTHY
 Firstly, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist.
 Secondly, we should brush our teeth with a toothbrush and fluoride tooth paste at least twice a day – once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal.
 Thirdly, we should eat food that is good for our teeth and our body such as milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables, and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay.
15. How often should we visit our dentist a year?

 We should visit our dentist twice a year 

16. What should we brush our teeth with?

 We should brush our teeth with a toothbrush and fluoride tooth paste

17. What else we can use to clean between our teeth after a meal?

We can also use wooden toothpicks to clean between our teeth after a meat

18. What kinds of food are good for our teeth?

 We should eat food that is good for our teeth and our body such as milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables, and fresh fruit

19. What kinds of food are bad for our teeth?

Chocolate, sweets, biscuits and cakes are bad for our teeth 

VI. Reorder the words to make the meaningful sentences 
20. hard – working/ is/ but/ her/ is/ lazy/ ./ She/ very/ brother 

⇒ She is very hard-working but her brother is lazy
21. does / always/My mother/the grocery shopping.
⇒ My mother always does the grocery shopping 
22. We/watch/often/TV/after dinner.
⇒ We often watch TV after dinner
23. students / their/homework/usually/The/do.
⇒ The students usually do their homework 

Chúc em học tốt !!!!