Ladies and gentlemen,please remain_____until the plane has come to a complete stop.
| A．seated | B．seating | C．to seated | D．seat |
To find the street where I lived in my childhood is no easy task because the city ______ so rapidly all these years.
| A．is changing | B．has changed | C．will have changed | D．will change |
----She must have gone back to the valley.
----No, she _____. The entrance to it was nowhere to be found.
A mustn’t B needn’t C couldn’t D hadn’t
She is late. What _____have happened to her?
A should B must C can D would
.We were all waiting for you .You _____for the seaside by yourself without leaving a message.
| A．mustn’t leave | B．shouldn’t have left | C．couldn’t have left | D．needn’t leave |
----Will Mr. Smith join us in the party ?
----He would, but he _____not . He sometimes likes to stay alone.
A must B can C needD may