The environmentalists said wild goats’______ on the vast grasslands was a good indication of the better environment.

There’s no ________ from my bedroom window except for some factory chinmneys. 

 I’m trying to break the _________ of talking in class.

With all these attractions ,it’s ___ that tourism is increasing wherever there is a Disneyland.

—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes, it’s a common ______ to tip waiter in a restaurant.