$#Cam$
` 1 ` : B
` -> ` Chỗ : Nick’s uncle, Mr. Brown met them at the bus stop and took them to his farm
` 2 ` A
` -> ` Chỗ : After lunch, they all went for a walk. In the large yard of the farm, they saw some farm machines.
` 3 ` C
` -> ` Chỗ : Among them is the biggest machine which is called a combine harvester.
` 4 ` D
` -> ` Chỗ : They were told that this machine can cut and thresh corn at the same time.
` 5 ` A
` -> ` Chỗ : After having some fruits and cakes, they said goodbye and went home.