①Most of us know that exercise is very important．We all need to exercise．Doctors say it is good　②____us．If children often exercise， they are more alert（靈活的）．This means they do better in tests and schoolwork．
    There are many ways to exercise．You can walk， run， swim， skate or play ball games．You should exercise in the following（下面的）ways．
    ?You have to like what you're doing．
    ?Exercise enough， but not too much．③每周鍛煉兩次．Thirty minutes each time④____（be）enough．
    ?Try all kinds of things until（直到……為止）you find one， two or even three sports right for you．
    Lots of people choose to exercise at fitness centers（健身中心）．Why？ Because there is lots of sports equipment（裝備）there．The equipment will help you exercise your arms， legs， and other parts of your body to make you healthy．Some people buy sports equipment for their homes．But it is very expensive．
    Exercising can be fun．Friends can exercise together at a fitness center， or they can play sports together outside．How do you exercise？

（1）把①處畫線部分譯成漢語

我們中的大部分人知道鍛煉是十分重要的．

我們中的大部分人知道鍛煉是十分重要的．

（2）在②處填上一個適當的介詞

for

for

（3）把③處畫線部分譯成英語

Exercise twice each week．

Exercise twice each week．

（4）用④處括號中所給詞的適當形式填空

is

is

（5）簡略回答問題．Why do many people choose to exercise at fitness centers？

Because there is lots of sports equipment there．

Because there is lots of sports equipment there．