Algebra is the branch of mathematics concerned with operations on sets of numbers or other elements that are often represented at symbols

The police officer lectured the children for ten minutes about the dangers to throw stones, but then let them off with  warning.

Mary found it hard to concentrate on her work because the noise .

This floor doesn’t need no more wax; there’s plenty already.

You don't know her, _    ?

An octopus has three hearts to pump blood throughout their body.

One of the four underlined parts marked A, B, C, D in each sentence is not correct in standard English. Identify them: 

If the doctors find in the remedy, a lot of people would be saved. 

He never goes home before he will finish his work.

Choose the correct answer to complete the sentence. "In the past, a lot of countries ______ having contributed to global warming"

The steam engine is usually thought of as a relative modern invention, but the Greeks built a kind of steam engine in ancient times

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

Gunpowder, in some ways the most effective of all the explosive materials, were a mixture of potassium nitrate, charcoal, and sulfur

................. money you gave me is not enough to buy ..................bicycle. 

I think she would forgive you if you ____ to speak to her. 

Vitamin E, which is found in nutritious foods such as green vegetables and whole grains, action as an antioxidant in cell membranes.

If I had known that you couldn’t eat eel, I ____ bought it. 

The waste from the chemical factory is extremely .......

As her focus changed, the love poetry that Edna St, Vincent Millay produced in the 1920’s increasing gave way to poetry dealing with social injustice

The student realized with disappointment that he had learned new nothing in the lecture.

Hawaii’s eight major islands and numerous islets form the only state in the United States that is not lie on the mainland of North America.

Jeff wouldn’t have bumped into the waitress if he ____ in such a hurry.