Are all the students from in your class—No, there are only 3 in our class. The others are from other countries.

that he managed toget the information?— Oh, a friend of his helped him.[ ]

Hello ,mum. Are you still on Lushan Mounain—Oh, no. We are back. We _______a really good journey.

下列各句中，没有语病的一句是 （ ）

Experts say walking is one of the best ways for a person to _____ healthy.