The correct answer is "cats." This is a plural noun, and we know we need a plural noun because of the plural verb "were." The other options are singular, so they would be incorrect if inserted into this sentence. Therefore, the best choice is "cats."

The correct answer is "sailors." We know this is the correct answer because it is a plural noun. The subject of the sentence has to be plural because the verb "have to wear" is in plural form. The other options are singular, so they would be grammatically incorrect in this sentence. The best choice is "sailors."

This question simply asks you to select the correct interrogative pronoun. Since the question is querying Paul's (suspicious) tardiness with regard to his exit interview, the only possible correct answer is "when."

Here, we are looking for an appropriate pronoun to use in the introductory phrase, one that would avoid a dangling modifier. A dangling modifier occurs when the pronoun used in an introductory clause does not match the subject of the main clause. Since "William Gardis" is the subject of the main clause, the masculine pronoun "his" is the only appropriate choice.

"They" is used to refer to the subject of a sentence. This sentence begins with the subject "middle school students," and so we know we need a plural pronoun to fill in the blank. The word "them" is used to refer to objects, not subjects, so it is the wrong choice. "It" and "he" are both singular, so they are incorrect as well. 

The correct answer is "it." This sentence requires an object pronoun, and "it" is the correct choice because the subject of the sentence is already there-clouds. There are no people involved in the meaning of this sentence, which is why we choose "it" instead of "he," "she," or "we."

The correct answer is "his." This sentence requires a singular possessive pronoun, because in this sentence, the chair belongs to the man. The only option that fits as both singular and possessive is "his."

The correct answer is "he or she." The subject of the sentence is "a student," which is singular, so the pronoun must also be singular. It is also talking about students, so the pronoun "it" is not appropriate. The only option that is both singular and can refer to students is "he or she," and so it is the best choice. 

The correct answer is "her." Since the subject is a singular female, the pronoun also needs to be singular and feminine. "Its" and "his" are singular, but aren't feminine, and "their" is plural.  The only choice that is singular and feminine is "her," so it is the best choice. 

The correct answer is "they." "They" is a pronoun used to refer to two or more people. Since the subject "survivors" is plural, we know we need to replace it with a plural pronoun. The other options "she" and "he" are singular, and the option "them" is used to replace the object of a sentence, not the subject. Therefore, the best option is "they."