I am pretty certain that the latest events you have just described can only _________ her unhappiness.
| A．take to | B．add to | C．come to | D．appeal to |
—A shy boy like John ________ give up a secure job and start his own business!
—Yes，nobody had expected that.
| A．would | B．should | C．might | D．could |
—Tom often drives carelessly.
—Tell him he ________ answer for it if he goes on behaving like that.
| A．shall | B．should | C．will | D．must |
He ________ your car by mistake because he didn't have the keys.
| A．mustn't have taken | B．shouldn't have taken |
| C．couldn't have taken | D．needn't have taken |
—The similarities between social networks are striking.
—That ________ come as no surprise，because they are all products of the Internet.
| A．should | B．shall | C．may | D．must |
—Hi，Joan.Any idea where Tom is?
—He ________ on the playground.I saw him there playing football just now.
| A．shall be | B．should have been |
| C．must be | D．might have been |