It is difficult to write rules that tell exactly when we should apologize, and it is not difficult to learn how to do it

These snakes will not cause you any serious harm. They are harmful.

Women nowadays have more free to participate in social activities.

We had better to review this lesson carefully because we will have some questions on it.

ON the wedding day, the GROOM'S family and relatives GO to the bride’s house BRING gifts wrapped in red papers.

A beaver uses its strong front_teeth to cut down trees and peel_off its bark.

Not one in one hundred children exposed to the disease are likely to develop symptoms of it.