1.Traveling across the ground at great speed, the cat nears the area where the pig is fighting for its life.

at great speed以很快的速度。通常用的有：at full speed,at high speed

2.When it attempts to leave, the cat finds it cannot move. 

attempt to企图，试图

例句：Henry attempted to secure the succession to the office.
      亨利试图继承这个职位。

3.This area turned out to be very rich in fossils.

turn out to be结果是, 原来是, 证明是

例句：It turned out to be a wild-goose chase.
      结果证明这只不过是一场徒劳。

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