KHÔNG CẦN GIẢI THÍCH Ạ!!! 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 people 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. Choose the sentence which is the best combination of the sentences. 36. He stayed at home. He was sick. A. He stayed at home because he was sick. B. He stayed at home so he was sick. C. He stayed at home because he is sick. D. He stayed at home so he is sick. 37. He had a stomachache. He didn’t wash his hands. (so) A. He didn’t washed his hands so he had a stomachache. B. He washed his hands so he had a stomachache. C. He didn’t wash his hands so he had a stomachache. D. He washes his hands so he had a stomachache. 38. Tom eats a lot of junk food. He drinks soft drinks too. A. Tom eats a lot of junk food so he drinks soft drinks too. B. Tom eats a lot of junk food and he drinks soft drinks too. C. Tom eat a lot of junk food and he drinks soft drinks too. D. Tom eating a lot of junk food and he drinks soft drinks too. Choose the best answer 39. My/chess/evening/plays/me/with/sister/every/. A. My sister plays chess with me every evening. B. My sister chess plays with me every evening. C. My sister plays with me chess every evening. D. My sister with me plays chess every evening. 40.Collecting/environment/save/the/helps/bottles/glass/. A. Collecting glass bottles save helps the environment. B. Glass bottles collecting helps save the environment. C. The collecting glass bottles helps save environment. D. Collecting glass bottles helps save the environment.