Not until he left home ______ to know _______ important the family was for him.
| A．did he begin; what | B．had he begin; how |
| C．did he begin; how | D．had he begin; what |
____ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station.
| A．For | B．I had | C．With | D．As |
It is ____ you deal with difficulties that shows ____ you are really like.
| A．what; what | B．how; what | C．how; that | D．which; how |
As is natural, a man as old as he ____ be very forgetful.
| A．can | B．should | C．would | D．must |
Can’t we just live in today, _______ the worries of tomorrow or the regrets of the past?
| A．free from | B．aware of | C．sure of | D．tired from |
I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.
| A．while | B．when | C．then | D．as |