A survey of the opinions of experts ____ that drinking a glass of hot milk before going to bed helps one sleep well．
| A．shows | B．show | C．is showing | D．have shown |
The visitor asked to have his picture taken _______ stood the famous tower.
| A．that | B．at which |
| C．when | D．where |
They kept trying _____ they must have known it was hopeless.
| A．if | B．because |
| C．when | D．where |
Why do you want a new job ______ you’ve got such a good one already?
| A．that | B．where |
| C．which | D．when |
He was about to tell me the secret ______ someone patted him on the shoulder.
| A．as | B．until |
| C．when | D．while |
I was about to go out ______ the telephone rang.
| A．when | B．suddenly |
| C．as soon as | D．directly |