Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

Did anyone acknowledge responsibility for the outbreak of the fire?

The use of lasers in surgery has become relatively commonplace in recent years.

Most ethnic groups in Vetnam have their own costumes that reflect their unique culture identities.

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

As tourism is more developed, people worry about the damage to the flora and fauna of the island.

She came to the meeting late on purpose so she would miss the introductory speech.

When we went to the airport to see her off, we had a traffic jam.

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

Sports and festivals form an integral part of every human society.

The shoplifter immediately admitted to her crime to the security guard.

Though many scientific breakthroughs have resulted from mishaps, it has taken brilliant thinkers to recognize their potential.

Many new graduates take a part – time job and barely make ends meet every month.

The museum dismissed the curator after some of the oldest paintings were damaged.

In daily communication, you should know how to interpret other people’s body language.

It is an occasion when strength and sports are tested, friendship and solidarity was built and deepened.

The teacher gave some suggestions on what could come out for the examination.

When preparing a diet, a person should be aware that vitamin D acts to increase the amount of calcium absorbed by the body.

With respect to maneuverability, few birds can equal the capabilities of the hummingbird, which hovers for long periods and even flies backward.

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

The bomb exploded in the garage; fortunately no one hurt.