TOEFL STRUCTURE PRACTICE 1

A microscope can reveal vastly _____ detail than is visible to the naked eye.

• than

• than more

• more than

• more

Narcissus bulbs _____ at least three inches apart and covered with about four inches of well-drained soil.

• should be planted

• to plant

• must planting

• to plant

Industrialization has been responsible for _____ most radical of the environmental changes caused by humans

• a

• the

• some of which

• which are the

In many areas the slope and topography of the land _____ excess rainfall to run off into a natural outlet.

• neither permit

• without permitting

• nor permitting

• do not permit

Color and light, taken together, ______ the aesthetic impact of the interior of a building.

• very powerfully influence

• very influence powerfully

• powerfully very influence

• influencepowerfully very

_____ that Rachel Carson's 1962 book Silent Spring was one of the chief sources of inspiration for the development of nontoxic pesticides.

• There is likely

• Likely to be

• It is likely

• Likely

Total color blindness, _____, is the result of a defect in the retina.

• a rare condition that

• a rare condition

• that a rare condition

• is a rare condition

_____ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.

• Even

• But

• Although

• So

Wherever there is plenty of rain during the growing season, life is _____ in various forms.

• abundant

• the abundance

• an abundant

• it abundant

Most of _____ archaeologists know about prehistoric cultures is based on studies of material remains.

• these

• what

• which

• their