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TOEFL - Error recognition Test 49

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

1. Nowadays illegally documents purchased are much more difficult to recognize than before.

A. illegally documents purchased
B. much more
C. to
D. than before

2. Because there are less members present tonight than there were last night, we must wait until the next meeting to vote.

A. less
B. than
C. were
D. to vote

3. The ordinary cold, which is ours most common sickness, is a rival disease whose cure has not yet been found.

A. which is
B. ours
C. whose
D. cure

4. After studying all the new materials, the student was able to rise his test score by twenty-five points.

A. After studying
B. all the new
C. was able
D. rise

5. Under the crust of the Earth are bubbling hot liquids that sometime rise to the surface.

A. bubbling
B. liquids
C. sometime
D. to