If we _________ now to protect the environment, we’ll live to regret it.
A. hadn’t acted B. haven’t acted C. don’t act D. won’t act
— Are you sure the delegation will come to our school next week?
— _____. The head of it has just emailed me about the departure time of their flight.
A. No wonder B. You bet C. Don’t mention itD. Definitely not
It suddenly occurred to me I hadn’t locked my door．
A．which B．where C．that D．whether
The result was not the same as they had expected, ______ was rather disappointing.
A. that B. which C. when D. what
London's road traffic map is like a cobweb(蜘蛛网) of small streets, offering drivers more _______ when one road is blocked.
A. barriersB. charactersC. similarities D. alternatives
We need some more facts and figures ______ we make the final decision.
A. since B. before C. after D. until
