Grammar Booster part 4 test 3

By observing REM, or rapid eye movements, …………………………. to know when dreaming occurs during sleep.

During the industrial revolution farmers have left  their fields and went to work in dimly-lit factories and mines.

The Irish brought the popular custom of Halloween to America ……………….. 1840’s.

Although discovered the X-ray in 1895, Professor Roentgen died poor and neglected without any honors in his lifetime.

It has been discovered that when bananas are completely ripe or cooked, they are one of the most digestion foods, and of great value in treating certain diseases.

At experimental agriculture stations many types of grass are grown ……………….. various conditions.

In Northern America, both the bison and certain species of bear is on their way to becoming extinct.

The overall efficiency of a system can be …………………………… that of its weakest element.

Many plants can grow in water, without any soil, …………………………….. nutrients are added.

Originate in Ethiopia, coffee was drunk in the Arab world before it  came to Europe in the 17th century.

Robots are being used increasingly in industry as they can work on large jobs faster, are more precise and ……………………….

Epsom salts, or epsonite, belong to the same class crystals  as  the gem topaz.

Amsterdam is a town who is sometimes referred to as the ‘ ‘Venice of Northern Europe” because of its canals.

Nitric acid ……………………. copper to give off brown fumes of nitrogen dioxide.

Either the storm or the spring tide caused flooding in  the Carolina coast.

The sea wasp releases a poison that  kill a person in three minutes.

The saturated fat in dairy foods is thought .. .. .. .. .. .. . .. .. .. . a factor in heart disease.

Although we are no longer young, we still  enjoy  to study languages.

A deep-orange color carrot, rich in vitamin A, has been produced at the University of Wisconsin.

One of Hana Claus’s experiments, a frothy ceramic, called Beerstone, was produced.

If you have an opportunity to choose your seat in the Listening Comprehension section of the TOEFL, you choose one near the speakers.

Many time in geological history the earth’s magnetic field has changed, with the north magnetic pole becoming the south, and vice versa.

People visiting Los Angeles usually take a tour of Universal Studios, go to Chinese theater and looking at the footprints of the stars.

Gemstone amber is the fossil sap off  ancient trees.

Pipe and cigar smoke is thought to be at least as dangerous as cigarette smoke; the much important and crucial determiner is whether you inhale the smoke.

Bees ……………………….display distinct preferences for different colors, but are also sensitive to ultra-violet light.

Before the 1920’s, scientists use to think an immobilized muscle would became weaker.

Halley’s comet approaches the earth, close to be visible, every seventy- five years.

………………… physicist, Gabriel Fahrenheit, invented the mercury thermometer in 1714.

One of the first rescue methods in space were called MOOSE:

manned orbital operations safety equipment.

Management . .. . .. . .. . .. . .. . .. .. as the organization and coordination of an enterprise.

The ruins of Mayan cities have recent been discovered in the Mexican jungle.

Jupiter ……………………. the largest planet in the Solar System.

Break dancing, or say ”some forms of dancing”, can cause serious injuries, according chiropractors.

When sugar …………………….. to yeast, fermentation takes place.

Nuclear waste has traditionally been stored in steel drums what  are subject to rust.

The Puritans, . . .. .. .. . . .. .. .. .. .. percentage of the earliest settlers in Massachusetts, were a pious, self-disciplined people.

The immune system is the bodies way of protecting itself  against viruses.

Deserts produce less than 0.5 grams of plant growth …………………………………. from every square meter.

The videodisc has the capacity to store  thousand  of visual images.