Hurry，Mary! You__________on the phone.—Oh，I__________.Thank you，Mom.

How often doyou chat with your friends online—. I’m busy with my study.

While shopping, people sometimes can’t help _______into buying something they don’t really need.[ ]

Most of us believe that there should be a(n) ______ of mutual(相互的) trust and respect between teachers and students in teaching.

She_______ thirty minutes_______ the piano every day.