As we all know, _________ exercise will help to strengthen the heart and improve circulation of the blood.
—What made her unhappy?—_____.
It was very dark,____Jane seemed to know which way to take at the crossroads.
Noise is unpleasant, ________ when you are trying to sleep.
It's quite warm here; we ________ turn the heating on yet.
Sarah made ______ to the airport just in time to catch her plane this morning.