IV. Find the mistake. (1m) 23. Laughing is good with health. A B C D 24. Some people have a very bad habit in littering in public. A B C D 25. People who live in a dusty area often suffer on diseases. A B C D 26. In prevent flu, we should keep our hands clean, our feet warm. A B C D READING. (1.0 m) Read the text and mark the sentences as True (T) or False (F). KEEPING OUR TEETH HEALTHILY 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 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. Mark the sentences T/F 27. We should not visit our dentist regularly. 28. It’s possible to wait until we have toothache, then we see a dentist. 29. We ought to brush our teeth twice a day. 30. People are advised to eat chocolate, sweets biscuits and cakes between meals.