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.
| A．vapour | B．steam | C．solar-energy__________ | D．atomic-energy |
Some of the students were late for the meeting, but I can’t remember _____.
| A．what | B．when |
| C．which | D．whom |
“Who told you?” “Oh, somebodyorother, I’ve forgotten _____.”
| A．what | B．when |
| C．which | D．who |
“Would you like a cup of coffeeora glass of beer?” “____ will do, but milk is _____ popular with me.”
| A．Neither, not | B．Both, more |
| C．Either, the most | D．All, the most |
“What do you think of them?” “I don’t know _____ is better, so I’ve taken _____ of them.”
A. what, both B. what, none
C. which, both C. which, none
______is known to us, he is the top student of our class.
| A．It | B．As | C．This | D．That |