1. It is hard to think of a world without medal.
句型分析：It为_________, to think of a--------medal为_________
句型归纳：
It+ be+ adj.+for sb.+ to do sth(该句式中作表语的形容词只能说明不定式的行为性质和特点，说明做某事怎么样，而不说明人如何。常见的形容词有easy、 important、 difficult、 hard、 possible、 impossible necessary等)
It + be+ adj.+of sb.+ to do sth（该句式中作表语的形容词为说明人的评价性形容词，表达不定式的逻辑主语的品行性格或性质。常见的形容词：kind、 nice、 good 、honest 、careful、 careless、 wise、 stupid foolish、 rude、 polite、 impolite等）
Eg:
1) __________________________________.(对我们来说学好英语是必要的)
2) ____________________________________.(你帮助我学习真是太好了)
3) We all think ________________________to make this mistake.(我们都认为你犯 这样的错误太蠢了)
2 . think of
1).想起，记起
I_________________________(想起我最好的朋友) when I saw the photo.
2) 打算，考虑
I am __________________________(考虑明年去国外)
3）评价，认为
你觉的这部电影怎么样？___________________________________.
He is well thought of by his classmates._________________________.
3.It is important to know how they react with different substances.
分析句子：it为_________, to know how------substances为___________
how引导_________从句。
react vi .反应 react with 与------起（化学）反应
react to 对------做出反应、回应
react on/upon 对-------有影响、起作用
react against 反抗，反对
1) Our eyes _______light.
2) I don’t know whether copper_________water.
3) Applause(掌声) _______a speaker.
4) He_____strongly______the plan.
4.The reaction of medal with these substances can be put in order.
put sth in order 把某物按顺序排列
_____________________________after you play with them。(玩后把你的东西整理有序)
in order 有序地，整齐 out of order 无序地，杂乱无章地，（机器等）失灵，出故障
All the things in the room were _____, but she quickly ___them ____.
A. in order; put; in order B. on order; place; in order
B. out of order; put; in order D. by order; place; in order
5. Here is a table with the metals that react most at the top, and the medal that react least at the bottom.
这是一个______句，正常语序为____________________________
That引导__________从句。以here/there开头的句子，谓语是be, lie, stand live ,exist等表示状态的不及物动词，或者是come, go, follow等词时，句子要全部倒装；另外以in, out, away, up, down等副词开头的句子用全部倒装；以地点状语开头的句子用全部倒装。
注意：1）上述倒装句当主语是人称代词时不倒装，当主语是名词时倒装；
2）此类倒装句不用于进行时。
1) ——May I use your pen? Mine is out of ink.
——____________.
A. Here you are B. Here are you C. You are here D. Here is it
2) .There lived an old man in the village.
3) .Here ______your uncle.
A. is coming B. does come C. came D. comes
4). The door opened and ______ Mr smith.
A. came in B. in came C. did come in D. in comes
5) .老师站在教室的前部。________________________________________.
5. Burn to form an oxide.
Form vi/vt 组成，构成，形成，产生
A plan _________(开始产生) in her mind.
Seven players________________(组成这只队伍)。
The little girl________________________________(养成洗手的习惯)before meals.
A simple scientific experiment:
1. Leave the tube for one week.把试管搁置一周。
Leave vt. 放置，不去动某物，使某人/ 某物处于某种状态
1） Leave the boy as he is._____________________
2） 谁没关灯？___________________
3） Don’t ___________________(不要使水一直流)。
2. This makes sure there is no air in the water.
make sure: 确定、确保、弄明白、保证、务必
1）You’d better make sure___________________________(何时何地开会)。
2）离开房间时你要确保关好所有的门窗。
___________________________________________________-
3)弄清晚会的时间和地点。________________________________.
3. Add some oil to the water.
add vt. / vi. 增加、添加、补充说、
add sth to sth 把-----加到----- 里
add to （=increase） 增加、增添
add up sth . / add sth. up 把-----加起来
add up to 共计、加起来总计
1)Don’t ____too much suger_____the coffer.
2) His coming _______our trouble.
3）Please ________all these numbers.
4)His whole schooling education____________no more one year.
5)You can look for new coins to add________your collection
A. up B. to C. up to D. /
6) I should like to ______that we are pleased with the result.
4. This will keep air out of the water.
keep -----out of 使------不进入、不接近、不卷入
1） Try your best to ______________their quarrel.
A. keep out B. keep away C. keep out of D. keep from
2) Keep the dog ______________(别让狗进入我的书房)。
keep off = keep away from 远离 、避开
请勿踏草坪____________________________.
5. conclusion 结论、总结
arrive at/ come to/ draw/ reach a conclusion 得出结论
in conclusion 总之、 综上所述
The long and tiring talk, filled with arguments and quarrels, ended in disorder, _____no conclusion at all .
A . arriving B. arrived at C.reaching D. and getting to
随堂练习：
1.把下列短语翻译成英语
1).与-----反应___________ 2). 使-----有条理 _________
3)．做一个简单的科学实验 ________________ 4).在------的底部___________
5).在------的顶部___________ 6).往------加入_________
7).电气设备_________ 8).使-----不进入___________
9).得出结&
管理员[sunyihang]评论：练习设计有针对性。
