problem with 'fill in the blank with only 1 most suitable word'

[Thang77]

Hello everyone!Have a nice day!
I am now made confused by the preposition in this sentence:
We were very glad ..... a rest after our long journey.
The answer is 'of' but I think 'having' is more suitable.
Tell me what you think.Thanks in advance!

[Duc]

Hello Thang,
Welcome to this website :D
As to your confusion , I think you should read this (I took from Longman dictionary):
"to be glad of an opportunity/chance/excuse to do something
Ex:They were glad of the chance to finally get the chance of sleep.
Ex: I was cold outside ,and she was glad of her coat"
I think it is only a special usage of ''glad''.
You can also look it up in the Longman dictionary for more about ''glad'' :http://www.ldoceonline.com/
Hope it can help you :D
Your friend
Duc :D
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Don't see your shade think you are great