From the four words or phrases (A,B,C or D), choose the one that best completes the sentence.

What exactly are you …….. at?

Viscosity is measurement describing the relative difficulty or easy with which liquids flow.

The nitrogen makes up over 78 percent of the Earth’s atmosphere, the gaseous mass surrounding the planet.

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

The better you are at English, more chances you have to get a job at international organizations.

The train _______ just arrived.

Engines used in space shuttles are much larger and more strong than the ones used in jet planes.

Education in Vietnam has improved since the government started a programme of educational ..................

Although the social sciences different a great deal from one another they share a common interest in human relationships.

Do you know ________ Vietnamese word for "penguin"? 

His emotional problems _______ from the attitudes he encountered as a child, I think.

Monica was so angry about the noise that her neighbours were making that she refused to __________ it anymore. 

The basic law of addition, subtraction, multiplication and division are taught to all elementary school students.

Identify the error in each sentence: The foreign student advisor recommended that she studied more English before enrolling at the university

Deep cratering, the sun is over 4200 miles in diameter with negligible gravity and atmosphere.

The Earth was flat, was believed by most people in the fifteenth century.

Ursula and Tess had their little differences at the beginning of their work but now they seem to be __________ quite nicely. 

Either Mr. Anderson or Ms Wiggins are going to teach our class today.

I remember Peter lives in ____ north, so we shouldn't be walking ____ east.

The tools used most often by floral designers are the knives, scissors, and the glue gun.

Identify the error in each sentence: What happened in that city were a reaction from city worker, including firemen and policemen who had been laid off from their jobs