There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.
It looks ___ it is going to rain.
___ you know the rules of swimming, you will be able to swim well.
Being League members, ___ we ought to work hard at our lessons;___ we ought to take an active part in social activities.
___ the clock structk twelve. I got home with my brother.
____ for a bus, I was reading a magazine.