_______,but it is also a great way to lower the number of greenhouse gases in the air.
| A．Not only a fun thing is it to do | B．Not only a fun thing to do it is |
| C．Not only it is a fun thing to do | D．Not only is it a fun thing to do |
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With a ______ expression on her face, she is _______ about what to do next.
| A．puzzled; puzzling | B．puzzling; puzzled | C．puzzled; puzzled | D．puzzling; puzzling |
.
He has three brothers, ______ is a doctor.
| A．all of them | B．all of whom | C．both of them | D．none of whom |
.
The old man is familiar ________ the old village.
| A．with | B．in | C．to | D．for |
.
He is a _______ teacher, and he explains every problem to his students with great ________.
| A．patiently; patience | B．patiently; patient | C．patient; patience | D．patient; patient |
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She wants to make friends with ________ shares her interest.