--- Is it convenient to you if I call you up at 9 o’clock tomorrow morning? --- I’m afraid not. I _________ a speech then.
Jane has lost weight by going on __________ diet and taking __________ exercise every day.
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.