The chairman thought________necessary to invite Professor Smith to speak at the meeting .
He pretended __________when his mother stepped into the room..
The stamps were __________ according to their styles and features.
Don`t worry! We are all prepared to ____________ all of the problems that may _________.
The day he had been looking forward to______________at last.
In our childhood,we were often __________by Grandma to pay attention to our table manners.