TOEFL Structure & Written ExpressionPractice

The radiation piercing the atmosphere ___ of tanning or burning in humans.

• it is the cause

• causing it

• is the cause

• the cause

The ___ during an earthquake are caused by seismic waves

• actually vibrate

• actual vibrations

• vibrations happen

• from the actual vibrations

Parent flamingos lose their intense pink coloring until ____

• weaning young

• their youth

• they wean their young

• young

Champagne can be purchased by the balthazar, ___ cannot be purchased in this amount.

• brandy

• but

• because brandy

• but brandy

---

has a beautiful red coat, red panda is caleed "hun-ho" or "fire fox" in China.

• Because it

• It

• On it

• As soon as

For every disease-carrying toxin, there is an antitoxin which ____ out the effect of the toxin.

• cancels

• the camcellation

• to cancel

• cancelling

Galileo's observations of the phases of Venus proved ___ formed the center of the planetary system.

• that the Sun

• the Sun is

• it is the Sun

• what is the Sun

The surgeon operating without delay on an inflamed appendix ___ a far more serious complication, which is the rupture of a gem-laden appendix.

• which prevents

• preventing

• prevents

• prevention

Unless ___ as injury-free as possible, older athletes can have their activity and quality of life affected.

• the remnants of

• to remain

• remaining

• remain

Scientists now know that the lack of an embryonic thumb in birds is why ___ almost impossible for birds and dinosaurs to be related.

• is

• it is

• is it

• it