Explanation:

Subject-Verb Agreement: The subject of a sentence must agree with the verb in terms of number. In this case, the subject is "Steve and ___" and the verb is "are going skiing."

Identifying the missing word: To determine the correct missing word, we need to identify the number of people involved in the sentence. The sentence states that "Steve and ___ are going skiing."

Using the pronoun "I": In this case, the correct pronoun to use is "I." The reason is that when we include ourselves as part of a group, we use the pronoun "I" as the subject of the sentence.

Example:
- Steve and I are going skiing. (correct)

Explanation of the rule: When referring to oneself along with others in a compound subject, use the pronoun "I" as the subject. This is because "I" is the first person singular pronoun and is used when the speaker is talking about themselves. In this sentence, we are talking about Steve and the speaker, so "I" is the appropriate pronoun to use.

Visual Explanation:

Subject-Verb Agreement:
- The subject of a sentence must agree with the verb in terms of number.

Identifying the missing word:
- The sentence states that "Steve and ___ are going skiing."

Using the pronoun "I":
- In this case, the correct pronoun to use is "I."

Example:
- Steve and I are going skiing. (correct)

Explanation of the rule:
- When referring to oneself along with others in a compound subject, use the pronoun "I" as the subject.