Select the word or phrase that makes this sentence grammatically correct.

Economics ------- my least favorite subject at school.

The correct sentence would be: "Economics is my least favorite subject at school."

In this sentence, "Economics" is the subject, and the verb "is" agrees with the singular subject to make the sentence grammatically correct.

The options A. "Are," B. "Am," and C. "Been" do not match the subject "Economics" in terms of verb agreement. "Are" is used with plural subjects, "Am" is used with the pronoun "I," and "Been" is the past participle form of the verb "be" and does not fit in this sentence.

Therefore, the correct word to make the sentence grammatically correct is D. "is."

The correct anwer is D. Her. Since "my mother" is possessive, we need a possessive pronoun to indicate ownership. "Her" is the correct possessive pronoun in this context. Therefore, option D is the correct choice.

The correct word to complete the sentence is "who."

He tried to remember the names of all the people who were there that night.

The correct sentence would be: "When a person finds oneself in a stressful situation, it helps to breathe deeply."

In this sentence, "oneself" is used as a reflexive pronoun to refer back to the subject "a person." It indicates that the person is experiencing the stressful situation.

The other options do not fit the context:

A. "Themselves" is a reflexive pronoun used for plural subjects or when referring to multiple individuals. In this sentence, we are referring to a singular person.

C. "Yourselves" is also a reflexive pronoun used for plural subjects or when referring to the second person. It does not fit the context of the sentence.

D. "Itself" is a reflexive pronoun used for inanimate objects or animals. It does not match the context of a person being in a stressful situation.

Therefore, the correct word to make the sentence grammatically correct is B. "Oneself."