If it will rain this afternoon, we will have to cancel our picnic

Many scientists contributed to the development of television, whether no one can be said to have invented it.

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

Some bacteria are extremely harmful, but anothers are regularly used in producing cheeses, crackers, and many other foods.

Florida, named by the Spanish exploration Ponce de Leon, is one of the fastest growing states in the United States.

Our house has been redecorated last week. You can still smell paint when you enter and the wallpaper has a striking contrast with the floor.

Most country music songs are deeply personal and deal with themes of love, lonely, and separation.

The British national anthem, calling “God Save the Queen”, was a traditional song in the 18th century.

Because the diamond is the hardest naturally occurring substance, it is used in industry for to cut, grinding, and boring other hard materials.

Although apples do not grow during the cold season, apple trees must have a such season in order to flourish.

Sorry, I can't find the number. I remember writing it on ............. back of an envelop. 

What exactly is the influence of air pollution ...... human beings?

From the airplane, passengers are able to clearly see the outline of the whole island

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

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

Jeff wouldn’t have bumped into the waitress if he ____ in such a hurry. 

Many people have stopped to smoke because they are afraid that it may be harmful to their health.

Before the Industrial Revolution come to America, the vast majority of the population had lived in rural areas

You have to study hard to keep pace in your classmates.

To see the statue of Liberty and taking picture from the top of the Empire State Building are two reasons for visiting New York City.

These engines used being started by hand. But now they are started by electricity