Psychologists suggest that to cure cruelty

In ancient Alexandria, visitors to temples

1. 
   didn't have to pay for the holy water they wanted
   
2. 
   had a choice of buying either holy or ordinary water
   
3. 
   weren't allowed to enter without paying a bit of money
   
4. 
   could buy holy water without having to talk to any sellers
   

2. The first automatic machines for selling tobacco

1. 
   let people decide what a fair price should be
   
2. 
   made it very easy for people to pay for the product
   
3. 
   relied on the general honesty of the customers
   
4. 
   had special devices to prevent theft
   

3. When the modern cigarette machines were first introduced, they were different from other machines selling products in that

1. 
   they were able to accept paper money and weren't limited to taking coins
   
2. 
   the customer didn't have to have the exact amount of money to buy from them
   
3. 
   customers could pay in money from other countries, not just the currency of that country
   
4. 
   they were found in train stations and also sold chewing gum to people who wanted it