—Can we ski on this mountain?
—Of course.However, at no time _______ you do so alone.
| A．could | B．might |
| C．need | D．must |
It is required that the students _____ mobile phones in their school, so seldom _____ them using one.
| A．should not use; you will see |
| B．mustn’t use; will you see |
| C．not use; you will see |
| D．not use; will you see |
When Alice came to, she did not know how long she_______there．
| A．had been lying | B．has been lying |
| C．was lying | D．has lain |
My parents made _____ their daily routine to go out for a walk in the evenings.
| A．this | B．it | C．that | D．what |
If you make__ most of forty-five minutes classes day after day, there will be ______switch in grades.
| A．/; / | B．the; / | C．/; a | D．the ; a |
I strongly suggest the person ________ out and explain all that has happened.
| A．referred to stand | B．was referred to stand |
| C．was referred to standing | D．referred to standing |