We must keep them away from the wetland ________ protect the wildlife around here.

下列各句中，没有语病的一项是（ ）

The weather in Beijing is colder than ________.

Now that she is out of a job, Lucy _____ going back to school, but she hasn’t decided yet

(2009天津河东一模)Some students arenet surfing．which does great harm to their physical and mental health