Air pollution, together with littering, are causing many problems in our large, industrial cities today.

An electrical fault is believed to be to ........... for the small fire which caused the meltdown.

Identify the error in each sentence: 

There (A) are (B) many single mothers and single fathers (C) which are raising children by (D) themselves.

Identify the error in each sentence: Unfortunately, the species has gotten extinct due to human activity.

Composer John Cage, used many unusual objects as instrument in his music, including cowbells, flower pots, tin cans, and saw blades.

Identify the error in each sentence: 

Only after food has been dried or canned it should be stored for future use.

There has been an announcement from the Principal that the students will not hear the bell ________ this week as it has broken.

Choose the best answer:

I wasn’t anxious ......... the first who died of snakebite.

The ancient Romans used vessels equipped with sails and banks of oars to transporting their armies.

The steam engine is usually thought of as a relative modern invention, but the Greeks built a kind of steam engine in ancient times.

By studying the fossils of pollen, which extremely resistant to decay, researchers can gain useful information about the vegetation of the past.

Identify the error in each sentence: 

Hoa’s parents didn’t allow her going to the cinema with her friends yesterday.

Mai is very interested___________ reading comics and detective books.

Scientists are still uncertain of what the universe originated millions of years ago.

After searching for evidence in the house, the police concluded that the thief must have come in through the window and stole the property while the family was asleep.

A book may be evaluated by a reader or professional writer to create a book ________.

Nuclear powers production in the us is controlled by the Nuclear Regulatory Commission [NRC].

The two kilograms of drugs which the police have seized is only the tip of the iceberg. They fear that far more are being smuggled and distributed.

Each of the nurse report to the operating room when his or her name is called.

Identify the error in each sentence: 

The photograph of the race’s final moments have been awarded the first place.

I will show you around the city when you ______ to visit me.