[单项选择]Why must the workers wear thick glasses
A. To see clearly.
B. To protect them from dust.
C. To protect them from bad light.

[单项选择]Why must the workers wear thick glasses
A. To see clearly.
B. To protect them from dust.
C. To protect them from bad light.

[单项选择]Why must the workers wear thick glasses
A. To see clearly.
B. To protect them from dust.
C. To protect them from bad light.

[单项选择]Why do the workers wear thick glasses
A. Because they can’t see.
B. Because the weather is very hot.
C. Because they will keep their eyes saf

[单项选择]
Who must wear identification badges
A. (A) All employees.
B. (B) Potential employees.
C. (C) Visitors with escorts.
D. (D) Visitors alone.

[单项选择]Why must they take Semco seriously
A. Because a company that can survive over a decade of Brazil’s inflation can’t just be neglected
B. Because transferring the model has much hope of success
C. Because the companies can together share the fruits of the success

[填空题]Why do nearsighted people wear glasses In order to see ______.

[填空题]Why do nearsighted people wear glasses
In order to see ______.

[单项选择]Why must employees keep projects a secret
A. The company makes secret airplanes.
B. The military is watching the company.
C. The projects are illegal.
D. The company is a secret.

[单项选择]Why must they meet at 7:00
A. Because they’re going to plant trees.
B. Because they don’t know the way.
C. Because they have to walk there.

[单项选择]Why must Mr Buck be back on Friday
A. It’s his daughter’s birthday.
B. It’s his son Sharon’s birthday.
C. It’s his wife’s birthday.
D. It’s his friend Sharon’s birthday.

[单项选择]
Why must air be pumped into the plane
A. The plane can’t fly without air.
B. The plane needs air for its refueling.
C. It meets the passengers’ needs.
D. It meets the pilots’ needs.

[单项选择]Why didn’t the woman wear the black dress（　）.
A. Because she dose not like it.
B. Because it does not fit her very well.
C. Because it is too formal for the occasion.

[填空题]Why must we pay taxes The answer is that the government needs money for many things, for example, to pay its soldiers, sailors and airmen, to build roads, bridges, offices, schools, etc, and to buy goods from abroad ; and only the people of the country can supply the money. One of the most important taxes is income-tax which a person pays according to the amount of his income, whether he is a merchant, a doctor, a lawyer, a shopkeeper, a miner or anything else. This is called a "direct" tax, because it is paid in money directly to the government. Another tax is paid on goods such as watches, jewelry, new clothes, tobacco, wine, etc, when they are brought into a country. Such a tax is paid as part of the price of these goods if they are late sold in shops. We call it "indirect" tax, because it is paid indirectly through the shopkeepers. People usually complain about having to pay taxes, but they forget that the money is spent on things that they and their families need. We need policeme