For this question, you need to add the correct form of the verb. It appears that you need to use the simple past OR the past progressive, depending on the situation. The simple past describes an action that happened once in the past. The past progressive describes an action that also happened in the past, but for a period of time.
I arrived at Sam's party at 9.30 pm. (Here, you did not continuously arrive, so use the simple past). Lots of people were dancing in the living room. (Here, dancing is a continuous action, so use the past progressive.) I went into the kitchen. Mike was there. He was standing in front of the fridge. He was eating a pizza. I said hello, but he did not hear me. I don't think he was listening. I left the kitchen and walked into the hall. Linda was sitting on the stairs. She was holding her head in her hands. Her shoulders were shaking, but she was not crying. She was laughing!
When trying to decide whether to use the simple past or the past progressive, think about whether an action is done once and is finished (I arrived at the party), or whether it is done continuously for awhile (I was laughing and shaking).