57I am sure you will excuse me _____ not telling you ahead of time

Will people use money_____100 years

Some people haven’t realized something as common as _______to the sun for a longtime will do harm to their skin and even cause skin cancer.

How wonderful to go away for a month, _____ all worries and responsibilities!

He ________ in America for 3 years when he was young, so he can speak fluent English