Not everyone has realized what ________important part the balance of ________nature plays in their life.
It is everybody’s desire that every effort___________ to reduce the pollution in our city.
.—Steve come back because the window is open. —Yes.but he _______left it open last night.
_________we sleep together or apart is one of the biggest cultural differences, and only in western societies ______ the feeling that babies should sleep apart from their parents.
____ they are closest friends is not clear though they live together.
A tunnel was built under _____ was a lake a year ago.