The United States _    one of the strongest countries in the world.

Mrs. Smith demanded that the heater _    immediately. Her apartment was freezing.

If Tan Son Nhat Airport __________clear of fog we'll land there

Identify the error in each sentence: 

Bella had better to change her study habits if she wants to be admitted to a good college

Choose the best answer among A, B, C or D that best completes each sentence: By the time he arrives everything ………

Read the following passage and choose the best answer for each blank.

As well as being a necessary life-saving skill, swimming also (26)________us with a source of great pleasure and relaxation. Swimming, as well as other water sports like diving, surfing or just floating on your back, are some of the best ways to have (27)________and keep fit at the same time. Water sports are enjoyable for people of (28)________ages and even babies can learn to swim.

For elderly people or (29)________with physical handicaps, swimming provides gentle, yet effective exercise. Swimming for fitness and recreation has been popular (30) ________the earliest times, for instance in ancient Egypt, Greece and Roma. Swimming competitions developed in the nineteenth century and swimming races were (31)_______ in the first of the modern Olympic Games in 1896. Now water sports are (32)________ all over the world and most towns have at least one swimming pool.

Most water sports - swimming, surfing and water-skiing, etc, take (33)________on the surface of the water, but scuba divers explore deep below the waves.

There they can find fascinating sea creatures and strange rockformations. Some archaeologists are divers. (34)________search the seabed for wrecks of ships sunk hundreds of years ago which (35)________ objects that show how people lived in ancient times.

(26)________

Identify the one underlined word or phrase that must be changed in order for the sentence to be correct.

Nathan is taking part in a research ........ on the effects of GM foods.

Choose the best answer among A, B, C or D that best completes each sentence:  “Where did you get these old dresses?” “We….. them in the old truck.”

My father didn't go to college; __________did my mother.

The prices at the restaurant across the road have __________ twice already this year - soon, I won’t be able to afford to eat there. 

Our parents didn't use to allow ________ at night.

Dinosaurs ............. believed .............. out millions of years ago.

When we visit   ...........  South, we stopped at  .............   Civil War Museum in  ................   Atlanta.

She spent an hour trying to install the software, but John finally _____ it out.

 I wanted to say goodbye to Jerry, but he..............

In Viet Nam, you shouldn't ................    at somebody's house on the first day of the New Year unless you have been invited by the house owner.

Today's weather will be a .................... of yesterday.

The jeans are too long; you should have them__________.

He ______ up the folk tune.

Identify the error in each sentence: 

Seldom did her classmates and she went on a picnic together.

Identify the error in each sentence: Because of bad weather conditions it took the explorers three days reaching their destination