At the library, the quickest way to locate varied, reliable information for your research paper is to
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a. check the readers' guide.
b. check the encyclopedias.
c. ask the reference librarian.
d. search the card catalog for related titles.

In the following sentences, commas are needed after which words? when the clark family planned their summer vacation to hell’s canyon they didn’t plan on having quite so many adventures. from the start they had to deal with a broken-down van a sick baby and torrential rains.