单项选择题

It is () to stare directly at the sun.

A. harmful
B. harmless
C. comfortable
D. safe

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单项选择题
() the garden, the old man went to have a rest.

A. Having been watered
B. Watering
C. Having watered
D. Being watered
单项选择题
The program on education is () watching.

A. worthy
B. worthily
C. worthiness
D. worth
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