—The problem isn't difficult for the children to work out, is it? —_____ . Perhaps they should have been given a more difficult one.
French is also ____ useful language with a long history .
. ___ is a fact that English is being accepted as an international language.
It is necessary that a college student ______at least a foreign language.
Sarah hopes to become a friend of ______shares her interests.
______leaves the room last ought to turn off the lights.