Let us not waste____________ time we have left.
It was not until I came here ________ I realized this place was famous for not only its beauty but also its weather.
We observed some young men __________into the building at 11:00 last night.
Hangzhou is __________beautiful city,and it is worth__________.
The boy is old enough to __________the difference ________right and wrong.
He fell in love__________Mary and asked her to marry__________him.