摘要：When on the pavement, cyclists should walk next to their bicycles to avoid causing any accidents.
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You must be careful when ___ on the highway.
A．you driving B．are driving C．driving D．you were driving
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Some seemingly harmless blogs might become harmful when ________ on the Internet by millions of people.
| A．to read | B．reading | C．read | D．being read |
You must be careful when ___ on the highway.
| A．you driving | B．are driving | C．driving | D．you were driving |
Some seemingly harmless blogs might become harmful when ________ on the Internet by millions of people.
|
A．to read |
B．reading |
C．read |
D．being read |
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