单项选择题

（）, such problems concerning environment protection are not as easy to solve as they look.

A、 Speak generally
B、 To speak generally
C、 Generally speaking
D、 General speaking

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单项选择题
My boss asked me to answer the phone, to take all messages, and（）some letters.

A、 to type
B、 typing
C、 type
D、 typewrite
单项选择题
As a student in that famous school, Henry used to look hurt when （）.

A、 scolded
B、 having scolded
C、 to scold
D、 scolding
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