He warned me to make an eye on my luggage as that place was full of thieves.

When actively hunting, a dolphin sends out transmitting about five signals every second.

Choose the best answer:

I am afraid of .............. by the strong wind.

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What about .............. a new cooker?

Choose the correct answer to the following questions.

She started working as a teacher of English ten years ago.

Professor Moore recommended the book ___________ all his students.

There are differences and similarities between Vietnamese and American culture.

We had planned to go to the movies, but, because of the amount of work I had, I spent the evening to study.

At the Hermitage, Andrew Jackson’s home in Tennessee, even his glasses have been left exactly where he lay them.

Dolphins can detect minute electrical discharges coming from its preys.

Choose the word or phrase that is CLOSEST in meaning to the underlined part in the following question.

She performed all her duties conscientiously. She gave much care to her work.

Disease is not as widespread than before because better preventive vaccine and vastly developed nutrition.

Choose the best answer:

She ..................... smoking two months ago.

Identify the error in each sentence: 

They worked (A) as receptionists (B) in this hotel since they graduated (C) from university in 2009 (D)

Lifelong learning involves the use of both formal and informal learning opportunities throughout people's lives in order to foster the ____ development.

National forests including land for animal grazing, as well as wilderness areas with scenic mountains and lakes.

Identify the one underlined word A, B, C or D that must be changed for the sentence to be correct: 

Reading requires more lighting than many other activities; therefore, the possibility of comfortable reading greatly vary depending on available lighting and time of day.

The coal is the world’s most abundant fossil fuel.

The worker bees choose one baby from the hive to become the new king and then feed it royal jelly made for pollen and saliva.

Choose the best answer:

I saw John ............. TV when I came to see him.

In human beings, as in other mammal, hairs around the eyes, in ears and in the nose prevent dust, insects, and other matters from entering these organs.