If you sleep less than 7 hours a day, you are more      to catch a cold.

Published in 1974,the book was a(n) _____ success and was soon translated into thirteen foreign lanuages.

The painting was         what it used to be because it was once watered by rain.

Each of us has to write a ______ report every three weeks.

We all know that the painting, named Racing Horse, is a(n) ______ example of Xu Beihong’s style.