Поставьте предложения в отрицательную форму. к выделенным словам поставьте специальные вопросы. he grants us a 3% discount for cash payment. you should have called your friend long ago. he knew what was wrong with the machine. the manager will be able to receive to mr. a. only in the afternoon. i had to sign this agreement only on monday. they have to transport their products by rail. participation in fairs helps promote our goods.

He doesn't grants us a 3% discount for cash payment.
You don't should have called your friend long ago.
He doesn't knew what was wrong with the machine.
The manager doesn't will be able to receive to Mr. A. only in the afternoon.
I  don'r had to sign this agreement only on Monday.
They doesn't have to transport their products by rail.
Participation in fairs doesn't helps promote our goods.

1) Hubert Cecil Booth, from London, invented a machine powered by electricity which would suck up dirt. His invention was granted a patent in 1901 as the world`s first vacuum cleaner.
2) In 1923, a watch repairer from the Isle of Man, John Harwood, realised that winding watches often caused dirt to get into the mechanism. He developed the self-winding wristwatch, which had an internal michanism and was much more accurate.
3) In 1995, Keith Campbell and Ian Wilmut, from Edinburgh, developed an invention which people have been arguing about ever since. They invented a way to clone animals, and in 1997, Ian Wilmut cloned Dolly the sheep

1) The Capital Of Canada (Ottawa) 
2)the Official language of Canada apart from English (French) 
3)the First inhabitants of Canada (the natives) 
4)What does the word Canada (village) 
5) What game was invented by canadian James Naismith, to give an opportunity to the students of the sports school to play sports indoors in the winter. (basketball) 
6)What was the motto of Canada is From sea to sea) 
7)the highest waterfall of Canada (by the way, it is several times higher than the Niagara falls) (Della falls) 
8)formerly known As the capital of Canada (Bayton) 
9)Who opened Canada (24 June 1497 John Cabot) 
10)national game of Canada (hockey)