All classifications of human societies and cultures are arbitrary.

He insisted on listening to the entire story.

When I mentioned the party, he was all ears.

Peter didn’t mean to be disrespectful to his teacher. He just couldn’t control his temper.

No vehicle weighing over 3.5 tons is allowed on this bridge, according to traffic signs placed at both ends of the structure.

In times of war, the Red Cross is dedicated to reducing the sufferings of wounded soldiers, civilians, and prisoners of war.

We watched as the plane disappeared behind the clouds.

Studies of climatology indicate that volcanic dust in the atmosphere may contribute to the onset of ice ages.

When being interviewed, you should concentrate on what the interviewer is saying or asking you.

At last, we succeeded in persuading those boys and girls to join our picnic.

Nobody knows the origin of the Vietnamese long dress. There was no evidence about where and when it appeared.

In my experience, freshmen today are different from those I knew 25 years ago.

The copperhead, a snake that strikes without warning, is considered more dangerous than the rattlesnake.

Many doctors are still general practitioners, but the tendency is toward specialization in medicine.

In my experience, freshmen today are different from those I knew 25 years ago.

Many political radicals advocated that women should not be discriminated on the basic of their sex.

Before the earthquake hit the area,many minor tremors were felt.

He made one last futile effort to convince her and left home.

There were so many members of the political party who had gone against the leader that he resigned.

We can use either verbal or nonverbal forms of communication.

It is really incredible that he is unaware of such basic facts.