The new group of students are better-behaved than theother group who stayed here___

Unluckily, when I dropped in , DrSmith ____, so we only had time for a few words

下列各句中，没有语病的一句是( )

—Itis, looks like spring is coming soon　—Yeh,It’ll just be a few more weeks

Not until _______ smoking ________ healthy lungs