Answer:
Question #1: She wanted to help her brother, so she forestalled their mother while he cleaned up.
Question #2: Not knowing his father was right behind him, he irreverently mimicked his older brother, disrespecting him.
Question #3: Due to his bad study habits, he had a vague idea about the topic, which caused him to fail the test.
Question #4: As the argument got more intense, her distress started to rise along with the tension in the room.
Question #5: Since it was summer, the tour guide started to prepare for the influx of tourists that had booked for the tour.