So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety.
| A．must not | B．should not | C．need not | D．cannot |
Whatever your parents______ you 一there is real Santa Claus. And I should know, because I’ve seen him myself !
| A．may tell | B．could tell | C．may have told | D．must have told |
一Could you tell me what happed last night ?
一I can't go into detail now because it _______ take too long.
| A．would | B．should | C．might | D．could |
— Mummy, I have broken my train.
一I told you so. You _______ on it.
| A．mustn't have ridden | B．couldn't ride |
| C．shouldn't have ridden | D．needn't ride |
You can't imagine that a top student ______ have failed in the college entrance examination.
| A．might | B．need | C．should | D．would |
Thank you for giving me a hand. I ______ in the experiment without your valuable help.
| A．have failed | B．will fail | C．would have failed | D．must have failed |