Answer:
"Hello Samantha," Trevor excitedly shouted.
"Hi, Trevor," responded Samantha.
"Want to go to the ice cream shop with me later," Trevor inquired energetically.
"No, I have dance practice later," she said in a somber tone, "I might be able to this weekend, though."
"It is official-- this weekend we will go to the ice cream shop," Trevor declared.
The characters then went their separate, both looking forward to the fun that they will have this weekend.
The punctuation mark that is not used internally in a sentence is a period (.). Periods are only used when ending a sentence therefore, it should only put at the end. Periods signal that the sentence has already ended and no continuation needed.
