exercises改为exercise。 【3】
Changbaishan is at Jilin Province.It is kept in its natural state for visitor to enjoy it.The height of the land varies 700 metres above sea level to over 2,000 metres.It is home for many plants and animals.Many people come here to study the unique plants and animals when others come to see the spectacular waterfalls.But，the most popular attraction in the reserve are Tianchi，or the Lake of Heaven.If you are luck enough to visit it with your loved one，don’t forget to make a wish to guarantee your love will be as deeply and lasting as the lake itself. 答案
at
Changbaishan is in Jilin Province.It is kept in its natural state for ∧visitor
visitors to enjoy it.The height of the land varies from 700 metres above for
sea level to over 2,000 metres.It is home to many plants and animals.Many people come here to study the unique plants and animals whenBut
while others come to see the spectacular waterfalls.However，the most are
popular attraction in the reserve is Tianchi，or the Lake of Heaven.If luck
you are lucky enough to visit it with your loved one，don’t forget to deeply
make a wish to guarantee your love will be as deep and lasting as the lake itself.
【4】
HIV is a virus that weaken a person’s immune system.You can have a HIV in your blood for a long time.However，eventual it will damage your immune system so much as your body can no longer fight disease.This stage of the illness was called AIDS.So far，almost everyone who has developed AIDS died.HIV is spread through blood or the fluid where carries the virus.The virus gets inside the body through breaking skin，or by injection.Certainly，scientists will find a cure to HIV/AIDS one day.But before that happens，you need to protect myself. 答案
weaken
HIV is a virus that weakens a person’s immune system.You can eventual
have a HIV in your blood for a long time.However，eventually it will as
damage your immune system so much that your body can no longer was
fight disease.This stage of the illness is called AIDS.So far，almost ∧
everyone who has developed AIDS has died.HIV is spread through where
blood or the fluid that/which carries the virus.The virus gets inside the
breaking
body through broken skin，or by injection.Certainly，scientists will find to
a cure for HIV/AIDS one day.But before that happens，you need to myself
protect yourself. 【5】
Stress is a state of being upset that happen when we are under pressure.We students have all experienced stress over problems in our daily life，test results，or too many homework.Since stress can make us sick，we have to learn what to deal with it.When you are stressful，don’t forget your hobbies.If you are fond music，just turn on the radio.Generally，people think TV may interfere with their children’s studies.However，if you worry about that your English and don’t know what to do，you can get help from English TV programs.It is also help to share your worries to your friends.They will surely give you some advices and help you out of trouble.As long as we treat stress proper，we can relax ourselves and keep away from its bad effects. 答案
happen
Stress is a state of being upset that happens when we are under pressure.We students have all experienced stress over problems in our
many
daily life，test results，or too much homework.Since stress can make us whatstressful
sick，we have to learn how to deal with it.When you are stressed，don’t ∧
forget your hobbies.If you are fond of music，just turn on the radio.Generally，people think TV may interfere with their children’s studies.However，if you worry about that\\ your English and don’t know help
what to do，you can get help from English TV programs.It is also helpful to
to share your worries with your friends.They will surely give you some advicesproperadvice and help you out of trouble.As long as we treat stress properly，we can relax ourselves and keep away from its bad effects. 28．答案 happen→happens
解析 a state是先行词，后面定语从句的谓语动词用单数形式，故把happen改为happens。 29．答案 many→much
解析 homework是不可数名词，故把many改为much。 30．答案 what→how
解析 固定搭配：what to do with sth./how to deal with sth.怎样处理某事，故把what改为how。
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