Not until ecent has interest in synthetic fuels been revived.

A progress has been made toward finding a cure for AIDS

Jack London, whom was known for his stories of Alaska, lived there during Klondike gold rush.

Many hundred years ago, there were many villages and little towns in England.

In its pure State, aluminum is a weak metal, but when combined elements such as copper or magnesium, it is formed alloys of great strength

It is  nearly perfect crystal structure that gives diamonds their hardness, brilliance, and transparent

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

After working hard for so long, we decided to enjoy ourself to  nice long holiday

Because of the availability of trucks and easy access to modern highways, the locate of farms has become relatively unimportant with respect to distance from markets

Jobs which are highly paid some countries are badly paid in other

The average temperatur Mars, the fourth planet from the Sun, is about eighty degrees than colder on Earth

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

Put _____ the cigarette, please. I don’t like the smell of it. 

Either humans and animals learn by experience, and what is learned influences planning and carrying out of simple actions.

Several people have apparent tried to change man’s mind , but he refuses to listen.

I put my new book of zoology here on the desk few minutes ago, but I cannot seem to find it.

Since fireworks are dangerous, many countries have preventing business to sell them.

He gave up his job _    he earned much money.

Everyday in summer, but especially at the weekends, all kinds of vehicles bring crowds of people to enjoy various attraction.

The living room was enough large accommodate two long sofas easily

Until recently , women were forbiddenlaw owning property.