“Would you rather wait or come back later?” “ _____.”
I had just stepped out of the bathroom ______ I heard the steps.
This is a very interesting book.I’ll buy it, .
Parent should take seriously their children’s requests for sunglasses _______ eye protection is necessary in sunny weather.
--- Do you know the reason _________ pilots turn off the plane’s lights before taking off? ---The practice is for the passengers to adjust to the dark _________ an emergency.
The process of curing a disease is like a war ___ different soldiers fight against an enemy.