It is possible that your flight will be delayed, so take a book to read.
case
Take a book to read ......................................... delayed
in case your flight is
They didn't go on a picnic because it was raining heavily.
rain
But ........................................... , they would have gone on a picnic.
for the heavy rain
Paying in cash entitles you to a special discount.
provided
You are entitled to a special discount ................................................ in cash
if you pay
Your experience on this site will be improved by allowing cookies.