The chairman was about to declare the conference open ____ the lights went all out.
| A．as | B．while | C．then | D．when |
Two years has passed since I ______you the first time．
| A．meet | B．have met | C．met | D．had met |
_______, nobody was injured in the accident．
| A．As it may seem strange | B．Because it may seem strange |
| C．Strange as it may seem | D．Strange as may it seem |
—Patrick has won $ 1,000．
—_____? He isn’t any happier．
| A．So what | B．So where | C．So why | D．So how |
There are severalplans here. Which one do you like best?
| A．alternative | B．conservative | C．passive | D．primitive |
—How much shall I pay for the food?
—You.This is free of charge.
| A．mustn’t | B．needn’t | C．shouldn’t | D．couldn’t |