It was ______ to go down the hills.

This book gives a brief _____ of the history of the castle and details of the art collection in the main hall.

“Why couldn’t they meet us at five o’clock?” “Because they were delayed by ________.”

There being no witness on the spot, the police were delayed by the ________of information about the crime. 

– Hi, Peter. How is your work getting along?– Very well. Everything is going on according to ______.