—How long did you do your homework? —______.
| A．Before it struck 10 | B．Since supper time |
| C．So long as I stayed up | D．Until 10 o’clock |
He has changed a lot. He _______ not what he _______.
| A．is, is | B．was, was |
| C．is, was | D．was, is |
________ cave that George has discovered in his lifetime is near the Alps.
| A．The hundredth | B．The hundred |
| C．Hundredth | D．A hundredth |
“You’ve left the light on.” “Oh, so I have. _____ and turn it off.”
| A．I’ll go | B．I’ve gone |
| C．I go | D．I’m going |
.Mr. Smith ________ me to buy several ________ eggs for the dinner.
| A．asked; dozen | B．suggested; dozens of |
| C．had; dozen | D．persuaded; dozens |
Residents ________ not to go out alone or to take part in any groups during the period of recent terrorist activities. 
| A．were always being warned | B．are always warning |
| C．always warned | D．had always been warned |