He never tells a lie, ________?

Ballet performers must be believable actor actresses as well as expert.

In the sixteenth century, Francois Vieta, a French mathematician, used vowels “a”, “e”, “i”, “o”, “u” to represent a unknown number.

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

I was such nervous that I didn’t think I would pass exam.

New uses for plastics were found during the 1950’s and 1960’s in medicine, space, research, industrial, and architecture

It’s a lovely old house, I agree, but can we afford moderning it?

It was near end of prehistoric times thatfirst wheeled vehicles appeared.

Being the biggest expanse of brackish water in the world, the Baltic Sea is of special interesting to scientists.

The world would look different if human eyes were sensitive to infrared radiation.

Esperanto is an unique language because it was created by a man called Ludwig Zamenhoff.

Cotton fiber, like other vegetable fibers, are composed mostly of cellulose

By the end of the month, I’ll be working for firm for a year.

Lewis and Clark had been gone for such long on their expedition that many thought they dead.

Sixteen people showed _____ for her volleyball training session. 

There are no easy ways to learn a foreign language, ______?

To raise successfully, farmers must selecting cattle for breeding and apply a dietary regimen

The officials object to them wearing long dresses for the inaugural dance at country club.

The fragrant leaves of the laurel plant to sell commercially as leaves and are used for seasoning foods.

Keep trying to learn English. Don’t give up. Eventually, you will succeed, even though you may not know how much time it will cost

Mary put on her scarf  .................  she ...............  not get cold.ould