Mr. Black was old, but able to _______quickly to changes in technology.
There are _____ flights between the two cities, _____ it convenient for people in one city to travel to work in the other.
Though faced with so many difficulties, they are _____ about their future.
The Sahara Desert is almost _____ of the US.
---It’s a long time since I saw Marry. --- _________ her this afternoon?
—Why are you crying? Today is your birthday! —_______. I am so excited with so many friends surrounding me.