三、阅读表达。
阅读下面短文，简略回答问题。
Shopping is fun, but how can we shop smartly? Here are some easy tips.
First, always make a list. Before going to the store, write down what you really need. This way, you won’t waste money on unnecessary things. Second, remember to check prices. Different stores sell the same item at different prices. Take a few minutes to check,
and you may find big savings. Third, look for sales. Many stores sell goods on sale at the end of a season or on special holidays. Buying during these times can save you lots of money. Finally, don’t blindly believe ads. Think twice before buying something just because an ad says it’s great. By following these tips, you can become a smart shopper and get more value for your money.
19. How can we save money when shopping? Please list two ways.

20. What does the writer think we should do when we see an ad?

21. What’s the main idea of this passage?

19. Make a list before going to the store. Look for sales.
20. We should think twice before buying something.
21. To give some easy tips on how to shop smartly.