The discovery of the antibiotic penicillin in 1928 has not produced antibiotics useful for treatment of infectious diseases until 1940.

The geology professor showed us sample about volcanic rock which dated back seven hundred years.

My father doesn’t know speak Korean

In the United State, the Cabinet consist of a group of advisers, each of whom is chosen the President to head an executive department of the government.

Hardly he had entered the office when he realized that he had forgotten wallet .

The American anarchist Emma Goldman infused her spirited lectures, publishes, and demonstrations with a passionate belief the freedom of the individual.

Because of it consists only of relatively short strand of DNA protected by a shell of Protein, virus cannot eat or reproduce by it self.

Leader emphasized the need for justice and equality between his people

He scored so good a goal that a cheer raised from the stands .

The sum of all chemist reactions in an organism’s living cells are called it metabolism

Some conifers, that are tree which have cones, are able to thrive on poor, thin soils

Usually the climate mountainous areas becomes much windy at higher altitude

In future, we will certainly lead a more healthier life 

Don’t buy from websites unless they list toll – free number so as you can call their customer service department if problem

A number of workers … asked for a rise since last month. 

Many poets enhance their work by creating contrast among realism and symbolism given poem.

Find mistakes and correct

Patrick was getting home last night, and unfortunately, the dog barking woke everyone up

It was after shortly microscopes were introduced at the beginning of seventeenth century micro organisms were actually sighted.

Find mistakes and correct

However types of raw materials are used in making paper, the process is essentially same

In a medical study of nearly 5.000 adults, half of them were given one aspirin a day and the other half given a placebo, it was found those taking Aspirin suffered 38 percent fewer heart attacks than those who weren’t

To see the statue of Liberty and taking picture from the top of the Empi State Building are two reasons for visiting New York City.