--Why are you so anxious? --It isn’t your problem ____.
We had a marvelous holiday: only the last two days were slightly _____ by the weather.
I could tell he was surprised from the _____ on his face.
I'd like to take _____ of this opportunity to thank you all for your cooperation.
________ of the land in that district _______ covered with trees and grass.
The number of people present at the concert was______than expected . There were many tickets left .