—I find it very difficult to read ________ novel you lent me last week.—Yes. It's necessary to have ________ good knowledge of history.
___, he was a man known to the people all over the town.
Use your head,___ you’ll find a good way.
___ happens, we’ll carry on the experiment.
It looks ___ it is going to rain.
___ you know the rules of swimming, you will be able to swim well.