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TOEFL - Error recognition Test 5

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

1. Although business practices have been applied successfully to agriculture, farming is different other industries.

A. applied
B. successfully
C. farming
D. different

2. Although there are exceptions, as whole, the male of the bird species is more brilliantly colored.

A. there are
B. as whole
C. more
D. brilliantly

3. In the United States, the bark the eastern hemlock is the main source of tannin for curing leather.

A. bark the
B. the main
C. source
D. for curing

4. Authors Samuel Eliot Morison won two Pultizer Prizes, one in 1943 for a biography of Columbus and the other in 1960 for a biography of John Paul Jones.

A. Authors
B. won
C. a biography
D. the other

5. When zippers are easy to use, it took almost half a century to perfect the zipper and find a way to manufacture them economically.

A. When zippers
B. it took
C. them
D. economically