13．Here is some advice on food shopping．Generally speaking，each family spends about one-sixth of its income on food．Because food is expensive，it is important to spend money wisely（21）B you shop．
A careful shopper can prepare nourishing （有营养的） and tasty meals inexpensively．Here are some suggestions to help you （22）Abetter．
Buy only the food you need．There are several ways to avoid buying （23）Dfood．First，（24）Aa shopping lit before you go to the store．Then，when you are at the store，（25）Byour list carefully．（26）B，do not go shopping if you are hungry．When you are hungry，foods look very tasty and you want to buy more than you need．（27）D，go shopping alone if you can．If you shop with your young children，they often ask you to buy unnecessary food like sweets．
When you have a （28）B，choose the least expensive brand （商标） of a product．There are （29）Apoints to remember when you buy canned tomatoes，for example．First，look at the advertisement in the newspaper to see if your supermarket is（30）Da"special"on canned tomatoes．（31）Bthis，when you are in the store，you should check the（32）A for each pound of tomatoes．Sometimes you save money if you buy the larger size can sometimes，however，you do not．Third，remember that a grade A product or a more expensive product is not necessarily more healthful （33）Ca grade B or less expensive product．Grade A tomatoes may look better，（34）B all canned tomatoes have the same nutrients．
Shoppers seem to have special（35）C when they buy fresh fruits and vegetables．There are several things to consider when buying fresh foods．Because fresh foods（36）B if they are not used，you have to buy the correct amount for the number of people you are serving．Next，（37）C to use fresh foods that are in season because fresh foods are （38）Bless expensive then．Lastly，choose fruits and vegetables that have a bright，fresh （39）C．A good colour is often a （40）Athat the food has a lot of vitamins．
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A careful shopper can prepare nourishing （有营养的） and tasty meals inexpensively．Here are some suggestions to help you （22）Abetter．
Buy only the food you need．There are several ways to avoid buying （23）Dfood．First，（24）Aa shopping lit before you go to the store．Then，when you are at the store，（25）Byour list carefully．（26）B，do not go shopping if you are hungry．When you are hungry，foods look very tasty and you want to buy more than you need．（27）D，go shopping alone if you can．If you shop with your young children，they often ask you to buy unnecessary food like sweets．
When you have a （28）B，choose the least expensive brand （商标） of a product．There are （29）Apoints to remember when you buy canned tomatoes，for example．First，look at the advertisement in the newspaper to see if your supermarket is（30）Da"special"on canned tomatoes．（31）Bthis，when you are in the store，you should check the（32）A for each pound of tomatoes．Sometimes you save money if you buy the larger size can sometimes，however，you do not．Third，remember that a grade A product or a more expensive product is not necessarily more healthful （33）Ca grade B or less expensive product．Grade A tomatoes may look better，（34）B all canned tomatoes have the same nutrients．
Shoppers seem to have special（35）C when they buy fresh fruits and vegetables．There are several things to consider when buying fresh foods．Because fresh foods（36）B if they are not used，you have to buy the correct amount for the number of people you are serving．Next，（37）C to use fresh foods that are in season because fresh foods are （38）Bless expensive then．Lastly，choose fruits and vegetables that have a bright，fresh （39）C．A good colour is often a （40）Athat the food has a lot of vitamins．
| 21．A．after | B．when | C．since | D．until |
| 22．A．shop | B．prepare | C．learn | D．spend |
| 23．A．expensive | B．cheap | C．tasty | D．extra |
| 24．A．make | B．write | C．take | D．bring |
| 25．A．observe | B．follow | C．mind | D．notice |
| 26．A．Therefore | B．What's more | C．As a result | D．On the contrary |
| 27．A．Besides | B．Above all | C．In a word | D．Finally |
| 28．A．collection | B．selection | C．possibility | D．number |
| 29．A．three | B．two | C．four | D．five |
| 30．A．making | B．supplying | C．carrying | D．offering |
| 31．A．Except | B．Besides | C．Because of | D．In spite of |
| 32．A．price | B．quantity | C．quality | D．size |
| 33．A．to | B．also | C．than | D．above |
| 34．A．and | B．but | C．also | D．for |
| 35．A．choices | B．interests | C．difficulties | D．pleasures |
| 36．A．destroy | B．go bad | C．dry up | D．go wrong |
| 37．A．refuse | B．offer | C．plan | D．expect |
| 38．A．especially | B．generally | C．completely | D．fortunately |
| 39．A．look | B．root | C．colour | D．leaf |
| 40．A．sign | B．mark | C．scene | D．luck． |