Many people nowadays have to wear false teeth when they was middle-aged.

Since the beginning of this century,(1)..................decay has greatly increased. The amount(2) ..................sugar in our food has also increased Doctors and dentists now know that(3)..........................is the chief cause of tooth(4) ................ Eskimos' teeth, for example, started to(5)..........when they began to eat sweet(6)..................

Long ago doctors did not like(7).........treat people's teeth. Barbers and blacksmiths(8)................after people's teeth and pulled them(9)............ when they decayed. Some people thought(10)..................................was a punishment from the gods.

1. The dirt on vegetables can cause you sick .

=> ..................................................................................................................

2. Scientists say that the life started in the ocean .

=> .................................................................................................................

3. He gave up to smoke 2 years ago.

=> ...................................................................................................................

4. He is a fast runner. He runs fastly.

=> ...................................................................................................................

5. Can I lend your pencil? I'm sorry. I'm using it.

=> ...................................................................................................................

6. You should keep silently when they are working.

=> ..................................................................................................................

7. How many times in a day do you brush your teeth ?

=> ...................................................................................................................

8. Long is worried because he has see the dentist.

=> ...................................................................................................................

1 Listening to music is more interesting than watching TV.

=> I prefer........................................................................................................

2. It isn't important for you to finish the work today.

=> You don't......................................................................................................

3. How much is this dictionary?

=> What ........................................................................................................?

4. How heavy is the chicken?

=> What...........................................................................................................?

5. Mr. Trung and Mrs. Trung type quickly .

=> Mr. Trung and Mrs. Trung..................................................................................

6. I got to work in half an hour yesterday.

=> It took ..........................................................................................................

7. My mother doesn't like coffee and tea.

=> My mother likes neither....................................................................................

8. You shouldn't eat too much candy.

=> You'd...........................................................................................................

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