短文改错：下面短文的划线部分有错误，请根据短文内容将其改正，并将正确答案写在题后的横线上。
Do you know something about the holiday camps in Hong Kong? The students in Hong Kong used to take
part in an English holiday camp in their holidays. And their parents weren't with them through they were very
young.
Now they still enjoy take part in (1) many kinds of holiday camps without their parents. Many parents let
their children take part in some kinds of holiday camps in order to learning (2) some practical knowledge in
their life. And also learn some knowledge about living skills, science, reading and writing….The more important
(3) for the children is to learn to look after himself (4).
Holiday camps in Hong Kong are not so expensive. Most of families can afford to send their children there
for further study, for making their bodies strong….And the government never charges for them.
It is saying (5) that students in Hong Kong have much knowledge about many things. Perhaps it has
something with the kinds of holiday camps.
1._________ 2._________ 3._________ 4.________ 5._________
龋深，穿髓孔探无感觉，叩诊（+），
间根尖处牙龈有瘘管开口，压挤少许脓液出。
前倾阻生，龈红肿明显，探龈袋深部有脓液。X片见