Read the passage.
Jason whistled merrily as he walked home from the bus stop. He waved to his friend Norman who was riding by on his bike. When he got
nearer his house, he stopped. There was no car in the driveway. Where is everybody, he thought. He walked in the front door and through to the
kitchen. Suddenly a bunch of loud voices yelled, "Surprise!" Jason turned in amazement and his jaw dropped. Grandpa and Grandma were there!
"Happy birthday, Jason," they cried.
Which words does the author use to show that Jason is surprised?
O 1. whistled merrily
O2. waved to his friend
3. where is everybody
4. his jaw dropped