1. There ______ a lot of people in the fast food restaurant last night. It ______ very busy.

Explanation:

This task requires filling in the blanks with the correct form of the verb 'to be' in the past tense (was/were/wasn't/weren't). We need to consider the subject of each sentence to determine whether to use 'was' (singular) or 'were' (plural). For negative statements, we use 'wasn't' or 'weren't'.

Answers:

1. There were a lot of people in the fast food restaurant last night. It was very busy.