I can’t stop smoking, doctor.— For your health, I’m afraid you________.

ys a strange, new dilemma faces Chinese pedestrians: should you help an elderly person who ________ into the street

下列各句中，没有语病、句意明确的一项是 （ ）

On weekends the Smiths usually drive to the countryside and ________ the fresh air there. [ ]

No worker and no engineer whoit is that is forthe explosion of the chemical factory.