and short of breath , Andy and Ruby were the first to reach the top of Mount Tai .

 Mr. Smith is very happy because the cars made in his factory have never been ______.

Our new house is  very___________ for me as I can get to the office in five minutes

John once worked in a remote mountain village school, which is ____only on foot. 

In recent decades, China is becoming one of the most _____countries in the world.