You must have missed the first train yesterday, ________ you?

ened to Dr．Wilson’slecture about the protection of wild animals, but I was unable to grasp its key.

It seemed to me that she was in doubt _____ Timmy lived or died. [ ]

I’m sure our football team will ________ the team from NO. Middle School.

To be________ engineer is my dream. I’m going to study math really_________.