A cut in the tissue is easy to heal but a(an) _______ to the heart, if possible, takes a long time to do so.
Our teacher taught us that water ___ at zero degree centigtade.
When I was a little child, Father told me the earth ___ round then sun.
The boy wrote_____last week.
There are ten___teachers and two hundred___students in the school.
Such men have made_____by developing oil businesses.