1 a) Where would you buy the items in the pictures?
This question requires visual context (the pictures) to answer. Without seeing the pictures, it is impossible to determine where specific items would be purchased.
1 b) Act out exchanges as in the example.
The provided dialogue serves as an example of an exchange:
This example demonstrates a customer asking for an item (crayons) and the shop assistant directing them to the appropriate shop (stationery shop) where the item is sold.