“Why couldn’t they meet us at five o’clock?” “Because they were delayed by ________.”
| A．heavy traffic | B．heavy traffics |
| C．crowded traffic | D．crowded traffics |
Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
| A．have run out | B．are running out |
| C．have been run out | D．are being run out |
It was foolish of you to take a taxi ______you could walk there in five minutes.
| A．where | B．as | C．How | D．when |
We would have called a taxi yesterday if Harold ______us a ride home.
| A．didn't offer | B．wouldn't offer | C．hasn't offered | D．hadn't offered |
His play was popular and every time ______about it, he owed his success to the support of his friends.
| A．talking | B．talked | C．to talk | D．when talking |
I should very much like to have gone to the party, but ______.
| A．I'm not invited | B．I won't be among the invited |
| C．they won't invite me | D．they didn't invite me |