.It's reported that in the past 50 years around 80 percent of Beijing's courtyard houses ___________.
While dancing happily at home,_______________ .
Some people argue using ____________ nature to meet our own needs may spell disaster, unless we start to look around and understand how _________ clean environment benefits us all.
-Do you mind if I keep pets in this building ? -_____________________.
---Excuse me, Sir, is the swimming pool open every day? ---______, only from 6:00 pm to 10:00 pm
_____ interested her most was the longitude line. It’s an imaginary line ______ the eastern and western halves of the world.