Unnecessary commas

In each pair, choose the sentence that uses commas correctly and that has no unnecessary commas.

For help with this exercise, see Unnecessary commas.

Example

1 of 5

Question

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◯ The kiawe, (Prosopis pallida), a species of mesquite, was transplanted to Hawaii in the early nineteenth century.
◯ The kiawe (Prosopis pallida), a species of mesquite, was transplanted to Hawaii in the early nineteenth century.
Unnecessary commas – 1

2 of 5

Question

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◯ Jolie’s parents encouraged independent thinking but required respect for others’ opinions.
◯ Jolie’s parents encouraged independent thinking, but required respect for others’ opinions.
Unnecessary commas – 2

3 of 5

Question

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◯ The border guards told their sergeant that the heat-sensing equipment was malfunctioning.
◯ The border guards told their sergeant, that the heat-sensing equipment was malfunctioning.
Unnecessary commas – 3

4 of 5

Question

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◯ The streets that three hours later would be bumper to bumper with commuters were quiet and empty except for a few prowling cats.
◯ The streets that three hours later would be bumper to bumper with commuters, were quiet and empty except for a few prowling cats.
Unnecessary commas – 4

5 of 5

Question

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◯ Some first-year architecture students, expect to design intricate structures immediately.
◯ Some first-year architecture students expect to design intricate structures immediately.
Unnecessary commas – 5