The teacher asked him why hadn’t he done his homework, but he said nothing.

Ecologists are trying to preserve our environment for future generations by protecting the ozone layer, purifying the air, and have planted the trees that have been cut down.

Although most species of small birds gather in groups at feeders provided by bird-watchers, the bright red cardinals usually appears alone or with its mate.

Upon reaching the destination, a number of personnel is expected to change their reservations and proceed to Hawaii.

After the police had tried unsuccessfully to determine to who the car belonged, they towed it to the station.

Some of his favourite subjects at school are Maths, English and Geographical.

It is important that you turned off the heater every morning before you leave for class.

Neither William or his brother stole the rambutans from our orchard.

My elder sisters, both of them were doctors, said they were too busy to pick me up.

Unlike many writings of her time, she was not preoccupied with morality.

Paris is much more exciting as I expected.

The Red Cross organizes and leads relief assistance missions after natural disasters such as floods, tsunamis, earthquakes, and homelessness.

Sex's education is instituted to help the student understandthe process of maturation, to eliminate anxieties related to development, to learn values, and to prevent disease.

In most countries music songs are deeply personal and deal with themes of love, lonely, and separation.

In very early times, people around the fire were entertained by storytellers with stories of heroes’ wonderful actions and victory.

Narcissus, a character in mythology, gazed at his own image in a pool so ardently that he fell into itself and downed.

If one type of manufacturing expands, it is like that another type will shrink considerably.

Although caffeine is a moderately habit-forming drug, coffee is not regarded as harmfully to the average healthy adult.

An ambitious person is committed to improve his or her status at work.

Minh Hanh, who is one of the most famous fashion designers in Vietnam, are preparing for a new show.

The Oxford English Dictionary is well known for including many different meanings of words and to give real examples.