It suddenly occurred to him he had left his keys in the office.
The young man is one of the few who __________ the plane crash.
Though he has to __________ a hard time,he still holds a positive attitude towards life.
I’m having a party next Saturday;put it __________ in your diary so you don’t forget.
Every time __________ I called on him,he was very busy.
It took __________ building supplies to construct these energysaving houses.It took brains,too