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TOEFL - Error recognition Test 1

Each question has one grammar mistake. Choose the underlined portion that has the mistake.
Questions 1 - 5 of 20

1. Rocks can be broken apart by water that seeps into the cracks and freeze in low temperatures.

A. broken apart
B. that
C. freeze
D. temperatures

2. Columbus, Ohio, the capital of the state, are not only the largest city in Ohio but also a typical metropolitan area, often used in market research.

A. are
B. the largest
C. but also
D. used

3. Although maple trees are among the most colorful varieties in the fall, they lose its leaves sooner than oak trees.

A. among
B. in the fall
C. its
D. sooner than

4. The teacher told the students to don't discuss the take-home exam with each other.

A. told
B. to don't
C. discuss
D. with each other

5. Because she didn't like shop very much, she did most of it with her personal computer.

A. Because
B. shop
C. did
D. with