Sometimes you go shopping and buy a lot of things, but you don’t really need them. What can youdo? Take a look at these tips. Maybe they can help you. First,    (19).    Before buying anything, stop for a second andthink “ Do I need it, or do I want it?” Don’t buy things just you want them. Only spend money on necessary things.Second, make a shopping list before you go. Shopping with a list will keep you from walking the store and buyingunnessary things. Those tips can’t help you? Try using the 30-day-rule. When you see something and you really wantit,    (20)    before you buy it. Maybe after some time, you will not want it. Follow these tips and save money. ＊ tip 訣竅 neceessary 必要的 list 清單 unnecessary 不必要的
19.
(A) only buy things on sale
(B) always think before you buy
(C) never buy thins at the store
(D) remember to check the price