Do some warming up exercise before sports. Or you _______ hurt yourself.

——Do you know where David is? I couldn’t find him anywhere. ——Well, he_______ gone far—his coat’s still here.

Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better．

 I didn’t know Headmaster Weng was away for Beijing. I       to his office yesterday.

–Do we have to talk with Jack about that matter?–Yes, I think we __________.