When _______ there, the postman found the door locked and then stopped _______ the letter in the mailbox on the wall.
.This washing machine is environmentally friendly because it uses _____water and electricity than _____models.
---Mom, what did your doctor say? ---He advised me to live _____the air is fresher.
If you traveling ___ __the customs are really foreign to your own, please do as the Romans do.
Although the wind has _____, the rain remains steady, so you will need a raincoat.
It was already past midnight and only three young men ____in the teahouse.