III. Read the passage and choose the best answer. (2 points) KEEPING OUR TEETH HEALTHY It is very important to have healthy teeth. Good teeth help us

III. Read the passage and choose the best answer. (2 points)
KEEPING OUR TEETH HEALTHY
It is very important to have healthy teeth. Good teeth help us to chew our food. They also help us to look nice.
How does a tooth go bad? The decay begins in a little crack in the enamel covering of the tooth. This happens after germs and bits of food have collected there. Then the decay slowly spreads inside to tooth. Eventually, poison goes into the blood, and we may feel quite ill.
How can we keep our teeth healthy? First, 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 peole wait until they have toothache before they see a dentist.
Secondly, we should brush our teeth with a toothbrush and fluoride toothpaste 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: 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.
1.Good teeth help us to _____________.
A. be nice B. have good eyesight C. chew our food D. be important
2.When food and germs collect in a small crack, our teeth _____________.
A. become hard B. begin to decay
C. send poison into the blood D. make us feel quite ill
3.A lot of people visit a dentist only when _____________.
A. their teeth grow properly B. they have holes in their teeth
C. they have toothache D. they have brushed their teeth
4.We ought to try to clean our teeth _____________.
A. once a day B. at least twice a day
C. between meals D. before breakfast
5.We shouldn’t eat a lot of _____________.
A. red rice B. fresh fruit C. fish D. chocolate
IV. Rewrite the following sentences using the given word. (2 points)
1.How high is the Big Ben Clock Tower ? (HEIGHT)
2.What is your son’s weight ? (HEAVY)
3.What is the price of this face mask ? (COST)
4.How long is the Mekong River ? (LENGTH)
5.How wide is the West Lake ? (WHAT )
V. Supply the correct form of the verbs in brackets. (1.25 points)
1.Ba (make) this cake for his sister yesterday.
2.Nam (not do) his homework at the moment.
3.Mary (not visit) Army Museum with her class last Sunday.
4.(not go) out, mummy. I don’t want (stay) at home alone.