—Can we ski on this mountain?
—Of course.However, at no time _______ you do so alone.
| A．could | B．might |
| C．need | D．must |
Sooner or later, the old palace will get ruined if ______.
| A．being left unrepaired | B．not left repaired |
| C．left unrepaired | D．having left unrepaired |
I often played truant then. How I wish I ______ the time on my study!
| A．spent | B．were spending | C．had spent | D．could spend |
To our great joy, his health has improved ______.
| A．a good many | B．a great deal | C．a large amount | D．a large quantity |
She likes to have everything in order so that she can ______ them when necessary.
| A．have a hand in | B．place hands on | C．put her hands on | D．lay her hand on |
Only when you ______ what you have learned to practice ______ say you have made it.
| A．stick; can you | B．apply; can you | C．use; you can | D．appeal; can you |