Have you mended your bike，Bob?一Yes，I______it twenty minutes ago.

________a teacher, I’ll try to teach my students well.[ ]

Hurry. Mike! The bus is coming.—Wait a moment, please! Let me see if there’s left.

“Can I take your now?”said the waiter.

I have to go to my guitar lesson____ 19:00 ____20:00____ the evening. [ ]