请帮忙将以下小括号内的5道题答一下,1、阅读理解Are you carrying too much on your back at school?You're not alone.Back experts in the United States are worried that young students are having back and neck problems as a result of car

请帮忙将以下小括号内的5道题答一下,1、阅读理解Are you carrying too much on your back at school?You're not alone.Back experts in the United States are worried that young students are having back and neck problems as a result of car
请帮忙将以下小括号内的5道题答一下,
1、阅读理解
Are you carrying too much on your back at school?You're not alone.Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks (schoolbags).
"It hurts my back when I run," said Oberlin Reyes,a student in Virginia."It's hard to get up the stairs with my backpack,because it's too heavy."
Oberlin is among students whose backpacks were weighed for a week in a recent study.
They had regular backpacks with two straps (带子) to carry them,but a number of students with heavy loads had switched to rolling backpacks (which have wheels and can roll on the ground).
Shirley Park,whose backpack weighed 10 kilograms,said she changed to a rolling backpack because she was starting to have back pain.
How much is too much?Experts say students should carry no more than 10 to 15 percent of their own body weight.A few students had one suggestion to lighten the load:less homework.
P.S.(附言) Doctor's suggestion:
① Lighten the load.Clean out binders (活页材料) and take home only the books you need that night.
② Wide straps are better.They send out the weight over your shoulders more evenly (均匀).And be sure to wear both straps rather than hanging the pack over one shoulder.
③ Pack smart.The heavier things should be packed closed to the back.④ Bend both knees when you pick up the pack,and don't just bend over at the waist (腰).（273 words）
（1）"_____" is the main idea of the text.
The problem of backpacks is worth studying
The problem made by heavy backpacks
What is the best backpack for a student
How to make students' backpacks light
（2）According to Enderlin Reyes and Shirley Park,we know ______.
students have to do too much homework
backpacks have to carry heavy backpacks
backpacks without wheels are bad for students
too much homework leaves students no free time
（3）If students follow the doctor's suggestions they ______.
may lighten their backpacks
can learn how to help themselves
may feel their backpacks are lighter
will know how to wear backpacks
2、交际用语
（4）-Oh dear!I've just broken a window.
-____________.
Great
Never mind
That's fine
Not at all
3、词汇与结构
（5）It is high time we ______ something to stop road accidents.
did
are doing
will do
do

请帮忙将以下小括号内的5道题答一下,1、阅读理解Are you carrying too much on your back at school?You're not alone.Back experts in the United States are worried that young students are having back and neck problems as a result of car
一、阅读
1.B The problem made by heavy backpacks
2.B (students) have to carry heavy backpacks (楼主打错字了吧)
3.C may feel their backpacks are lighter
二、交际用语
4.B Never mind.没关系.
三、词汇与结构
5.A did
固定句型“It's (high/about) + that从句”中,that从句必须使用虚拟语气,即从句使用一般过去时或谓语由“should + 动词原形”构成,而且should不能省略.
另：该题答案也可以是：should do.