Do you know the reason ……. humans are interested in Mars and other planets in thesolar system?

Lawrence Robert Klein received the 1980 Nobel Prize in economics for pioneering the useful of computers to forecast economic activity.

My mother doesn’t care how much does washing machine cost because she is going to buy it anyway.

How much times did Rick and Jennifer have to do the experiment before they obtained  results they had been expecting?

.............. hard he has worked, he hardly supports his family of ten people.

Dreams are commonly made up of either sual and verbal image

Author has not rarely written anything that was not a best-seller

The bold way in which Margaret Mead defined the terms “family” – based as much on choice as on biological relationship – is possibly most enduring of her legacies.

The most of the energy used in our homes and factories is generated coal, oil and natural gas

While the sun is the major source of ultraviolet rays, it is not source only

Until recently, photocopy machines were regarded strict as business and professional office equipment that required  lot of expensive service.

Science and technology are part of the knowledges educated people

I _____ the film last night because I _____ it several times before.

Isle Royale National Park in Lake Superior can only be reached by boat

During his twelve year there, Ellsi Marsalis turned the New Orleans Center for the Creative Arts into a rich training place for jazz stars.

Neil seemed to have a good time at the party, ____?

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

The quality of these recordings __________ not very good.

I did not realize that I had left umbrella on the bus when it started to rain.

It is difficult to get used to sleep in a tent after having a soft comfortable bed lie on.

You are going to come to the party, ____?