—Are you ready for Spain?
—Yes，I want the girls to experience that________they are young.
| A．while | B．until |
| C．if | D．before |
I _____ have written to him because he phoned me shortly afterwards.
| A．ought to | B．must | C．couldn’t | D．needn’t |
Sir, you ______ be sitting in this waiting room. It is for women and children only.
| A．oughtn’t to | B．can’t | C．won’t | D．needn’t |
He hurt his leg climbing the mountain; otherwise, he _____ the meeting.
| A．will attend | B．had attended | C．would have attended | D．would attend |
— Turn off the TV, Jack. ____ your homework now?— Mum, just ten more minutes, please.
| A．Should you be doing | B．Shouldn’t you be doing |
C．Couldn’t you be doing | D．Will you be doing |
The thief ________ in from the kitchen window as the door was closed.
| A．may climb | B．must have climbed |
C．could have climbed | D．should have climbed |