The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.
| A．while | B．when | C．as | D．until |
They hand down the __________ from generation to generation to keep their life alive.
| A．custom | B．method |
| C．habit | D．form |
She went to meet him with an air of expectancy, __________ expecting him to bring something.
| A．as if | B．even if | C．if | D．as |
We chose to take a plane __________.
| A．in all | B．after all |
| C．at all | D．above all |
Passengers stand and stretch as the train __________ the railway station.
| A．pulls | B．pulls out of |
| C．pulls into | D．pulls to |
I want to leave now; I can't __________ nothing useful here.
| A．stand to do | B．stand doing |
| C．stand being done | D．stand to be doing |