单项选择题

A dam is usually built ______.

A．to cover the houses and fields
B．for people to have the right amount of water at all times
C．to help crops grow better
D．to form a large lake
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单项选择题
A．tendedB．watchedC．workedD．paid
A．tended
B．watched
C．worked
D．paid
单项选择题
Why do we try to hide our sense of loneliness when we start a new job
A．Because we are shy.
B．Because we have no friends.
C．Because we have no relatives.
D．Because we have to live.
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