Why did David decide to leave school and start working？
A. He received lots of job offers.
B. He was eager to help his mother.
C. He lost interest in school studies.
D. He wanted to earn his own living.
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From the passage we can guess how old was the girl？
A. 5.
B. 12.
C. 16
D. 20
David Smith wears casual clothes now, because______.
A. they make him feel at ease while working
B. he cannot afford to buy expensive clothes
C. he looks handsome in casual clothes
D. he no longer works for any company
After having asked somebody a question, it'll be polite of you to______.
A. make clear what kind of person he is
B. listen to his reply attentively
C. wait quietly and patiently for his answer
D. go on asking him more questions
What can be inferred from the fourth paragraph？
A. Farm areas accept waste from the city in modem society.
B. There is cheap land to bury waste in modem society.
C. It is difficult to find space to bury waste in modem society.
D. Ways to deal with waste in modem society stay the same.
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