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Questions from TOEFL

Posted by Tom on April 26, 2003

Hi!

I have some questions which are hard for me to understand.

1. During 19th and 20th centuries, human incursions into the habitat of the wolves _______ a devastating effect on their population.

The answer is [has had]instead of [have had]. I wonder why.

2. The plot of The load of the Rings is centered upon the need to destroy the ring of corrupting force and immense power by traveling to the far land of Mordor.

The problem part in this sentence is [the need to destroy the ring]. I wonder why this phrase is wrong.

3. Despite its ferocious image in the popular imagination, a gorilla is essentially a peaceful creature, given to fighting only in life-threatening situation.

The book says that [a gorilla] is wrong. I feel this phrase is right. Is this wrong?

7. A personal trainer will require a combination of aerobic and anaerobic exercise along with a sensible diet in order that the trainee ________ complete health.

[obtain] instead of [obtains] is a right answer. Maybe this is the subjunctive moode?

Thank you very much for your help.

Tom