264. The invention of the coal-burning_______engine revolutionized industrial production in the 18th century and opened the way to the development of mechanized transport by rail and sea.
.Inthedarkstreet,therewasn’tasingleperson,_______shecouldturnforhelp.
.My brother wants to work in the factory which ______ still ______.
This is one of the happiest days ____ spent in my life.
---I _____ to a party, but I’ve got nothing to wear. --- Why don’t you have a dress made for the party?
This book _____ ten units, ______ three mainly revision.