题目内容：

    Chewing gum (口香糖) may be one of your favorite sweets. But did you know how it was ____?

The sweet was invented by American scientist Thomas Adams. However, he invented it completely __ .

It was 1869. Earlier that year, one of Adams' friends showed him an interesting kind of sap (树汁). His friend told him_____ people in Central America liked to chew (咀嚼) on it for fun. Hundreds of years passed, people didn't do that any longer. But Adams was interested in the sap. He wanted to use it to create some new ____ .

Adams, however, ________ to create the products he wanted. He felt bored and________ and happened to chew on the sap. _______ , the sap tasted great. Adams then added something else to the sap and started selling it. Later in 1869, he opened a factory to produce this delicious _______ .

In 1888, Adams gave a ________ to the invention: "chewing gum." The sweet can be got from selling machines at underground stations all over New York City. Over the years, new kinds have been _______ . Now, chewing gum is popular among many people. However, few people know this was all started by an American scientist from a mistake.

1.A.eaten B.polluted C.sold D.invented

2.A.in public B.by mistake C.in person D.by hand

3.A.ancient B.single C.famous D.sick

4.A.products B.records C.crops D.fruits

5.A.agreed B.preferred C.failed D.afforded

6.A.angry B.nervous C.lucky D.satisfied

7.A.Usually B.Surprisingly C.Slowly D.Clearly

8.A.dish B.meal C.drink D.treat

9.A.method B.name C.prize D.menu

10.A.divided B.stored C.developed D.repeated