The reason__________ their failure you know is they didn't get fully prepared for the experiment.
| A．why.., that | B．that.., why | C．for.., that | D．why.., because |
________he can't understand is ________his son doesn't like the school.He is very upset about this.
| A．That；why | B．Why；that |
| C．What；why | D．Whether；that |
It was perfectly all right，he said，because the police ________him of anything.
| A．hadn't suspected | B．hasn't suspected |
| C．will suspect | D．didn't suspect |
Mom，I lost ________diamond ring you bought for me as my birthday present.Could you keep ________eye out for it when you clean my bedroom?
| A．a；an | B．a；the | C．the；an | D．the；the |
Sorry，madam.You'd better come tomorrow，because it's ________the visiting time now.
| A．during | B．at | C．beyond | D．before |
If you don't buy insurance for your car，you may ______losing everything when it gets destroyed in an accident.
| A．delay | B．deny | C．avoid | D．risk |