Arrange the sentences logically:
1. He was terrified by the noise.
2. Suddenly, a loud sound was heard.
3. Everyone looked towards the door.
4. The children ran out of the room.
A shopkeeper buys an item for Rs 2000 and marks it up by 50% to set the marked price. He then offers a 20% discount on the marked price. What is the profit earned by the shopkeeper?
Choose the most appropriate word to fill in the blank:
He was so tired that he ____ walk.