Problem: How does the sentence end?

At the cosplay convention, Jason showed Brian his new costume because
Answer: Brian was interested in it.

Problem: How does the sentence end?

Adam was summoned to appear before the court to testify in the trial, but the lawyer called a recess and the
Answer: trial was delayed.

Problem: How does the sentence end?

Emily took a long time to look at the menu, while Christine took a short time, so
Answer: Christine ordered first.

Problem: How does the sentence end?

Kenneth was an excellent swimmer but Brian did not know how, so
Answer:
Kenneth stayed in the deep water.