I hope you don’t mind me asking, _____ where did you buy those shoes?
The old man used __________ in front of his house and he has got used to __________ like that.
I found the homework was not so heavy as __________ I __________ to get in my old school.
—May I ask a question after class, Sir?— __________, but not during my lunch break.
Many people have fully realized it's important to keep __________ balance of __________ nature. Otherwise, humans will be punished by it.
He lost his __________ and fell off his bicycle.