Respuesta :
Answer and Explanation:
1. B: Its is incorrect because it is a determiner; the correct is to use the contracted form of it is : it's. It's going to be difficult to prepare.
2. B: Who is incorrect because the preposition from requires an object, and the appropriate pronoun is whom . From whom should...?
3. D: Their is a determiner, but the correct is the contracted form of they are : they're. They're getting into lots of mischief.
4. B: present Progressive : is listening is an action in progress in the present. It is present progressive (or continuous) tense.
5. C: Past: Left is the past of the verb leave . Simple Past tense.
6. D: Past Perfect : The action "He had thought" happened before the action "it was".
7. C: Most famous. This the superlative for the adjective famous: The most famous
8. C: Busiest. The adjective busy is short, and its superlative is formed by replacing y by i, and adding est: the busiest