One of the reasons why men invented certain sounds to express thoughts and actions was that______.
A. they could write them down
B. they could agree on certain signs
C. they could communicate with each other
D. they could combine them
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They have done things that they ought______.
A. not to do
B. not to be done
C. not to have done
D. not having done
He used to get up at six in the morning, ______？
A. used he
B. did he
C. didn'the
D. should he
According to the passage, which people seem to age slower than the others？
A. Shop assistants, lawyers, and professor.
B. Farmers, doctors and clerks.
Clerks, professor and farmers.
D. Lawyers, professor and doctors.
Finally the accused confessed to______the girl.
A. kill
B. killing
C. have killed
D. having killed
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