填空题：Americans use many expressions with the word“dog”.People in

Americans use many expressions with the word“dog”.People in the United States love theirdogs and treat them well.31 However，dogs without owners to care for them lead a differentkind of life.The expression，to lead a dog’s life，describes a person who has an unhappy exist-ence.
Some people say we live in a dog-eat-dog world.32 They say that to be successful，aperson has to work like a dog.This means they have to work very，very hard.Such hard work can make people dog-tired.And，the situation would be even worse if they became sick as a dog.
33 This means that every person enjoys a successful period during his or her life.To besuccessful，people often have to learn new skills.Yet，some people say that you can never teachan old dog new tricks.They befieve that older people do not like to learn new things and will notchange the way they do things.
34People who are unkind or uncaring Can be described as meaner than a junkyard dog.
Junkyard dogs live in places where people throw away things they do not want.Mean dogs are of-ten used to guard this property.They bark or attack people who try to enter the property.However，sometimes a person who appears to be mean and threatening is really not SO bad.We say hisbark isworse than his bite.
Dog expressions are also used to describe the weather.The dog days of summer are the hottestdays of the year.A rainstorm may cool the weather.But we do not want it to rain toohard.35.
阅读以上短文,从下列选项中选出准确答案.完成题.
A.Still，people say every dog has its day.
B.We do not want it to rain cats and dogs.
C.Some people are compared to dogs in bad ways.
D.Dogs are their best friends and they are loyal to people.
E.There are many other expressions waiting for you to explore.
F.That means many people are competing for the same things，like good jobs.
G.They take their dogs for walks，let them play outside and give them good food and medical care.
第31题应填__________