In this factory, suggestions often have to wait for months before they are fully _____.
It ____ be our headmaster. He has gone to Beijing.
---Would you like to go to the concert with me, Mary? --- I have got no interest in it; ____, I have lots of homework to do.
Papermaking began in China and from here it ____ to North Africa and Europe.
We needed a new cupboard for the kitchen. So Peter made____ from some wood we had.
The car ran down the hill, and the driver _____, according to the newspaper, to have been killed.