David and Mike are going to （planting trees） this afternoon.

一、~the + est + 名词 + (that) + 主词 + have ever + seen ( known/heard/had/read,etc)
the most + 形容词 + 名词 + (that) + 主词 + have ever + seen ( known/heard/had/read,etc) 例句：Helen is the most beautiful girl that I have ever seen.
海伦是我所看过最美丽的女孩.
Mr.Chang is the kindest teacher that I have ever had.
张老师是我曾经遇到最仁慈的教师.
二、Nothing is + er than to + V 或者 Nothing is + more + 形容词 + than to + V
例句：Nothing is more important than to receive education.
没有比接受教育更重要的事.
三、~cannot emphasize the importance of too much.（再怎么强调...的重要性也不为过.） 例句：We cannot emphasize the importance of protecting our eyes too much.
我们再怎么强调保护眼睛的重要性也不为过.
四、There is no denying that + S + V ...（不可否认的...）
例句：There is no denying that the qualities of our living have gone from bad to worse.
不可否认的,我们的生活品质已经每况愈下.
五、It is universally acknowledged that + 句子~（全世界都知道...）
例句：It is universally acknowledged that trees are indispensable to us.
全世界都知道树木对我们是不可或缺的.
六、There is no doubt that + 句子~（毫无疑问的...）
例句：There is no doubt that our educational system leaves something to be desired.
毫无疑问的我们的教育制度令人不满意.
七、An advantage of is that + 句子 （...的优点是...）
例句：An advantage of using the solar energy is that it won't create (produce) any pollution.
使用太阳能的优点是它不会制造任何污染.
八、The reason why + 句子 is that + 句子 （...的原因是...）
例句：The reason why we have to grow trees is that they can provide us with fresh air./ The reason why we have to grow trees is that they can supply fresh air for us.
我们必须种树的原因是它们能供应我们新鲜的空气.
九、So + 形容词 + be + 主词 + that + 句子 （如此...以致于...）
例句：So precious is time that we can't afford to waste it.时间是如此珍贵,我们经不起浪费它.

1.wa dong
2.fang shu
3.tian dong
4.jiao shui
5.deng huo

Today is The Tree Planting Day,I and my classmates go to park to plating trees.Why we planting trees? The zoology systom of China is very bad .If you know why Japan is very development than China,Beca...

B
A后面跟活动
C后为me
D应有介词

It was a very nice day yesterday,I went to West Mountain with my classmates to plant trees.We were divided into several groups and competed with each other.The group which planted the most trees would win a prize.Therefore everyone of the groups were working very hard.Some were digging holes,some planting the trees and the others helped to water the newly planted trees.
We planted a lot of trees there.At the end of the competition,everyone was so tired but were enjoying ourselves.Also,our group had won the competition.We beat the group in the second place by just one more planted tree.Everyone in our group were so excited and we claimed prize of a piece(not a bar!) of chocolate each.And we all went home happily.
原文翻译:
昨天的天气很美,我和同学们到西山去植树.我们被分为几组比赛,植树最多的一组将会赢得一个奖.於是每组的同学都努力地工作,一些人挖坑,一些人栽树,其馀的替新植的树浇水.
我们在那儿种植了很多树,比赛完毕後,每个同学都後疲累但我们大家都干得非常快乐.而且我们的组还赢了这场比赛,种多了比第二名的一组只有一枝树!我们组里人人都很是兴奋.领取了每人一块(不是一排!)巧克力的奖励!然後大家便快乐乐地回家.
已照了你的资料和加了一些情节写成.希望会对你有助,

Trees are important _to__ us.
Planting trees is important __for__ us.

It was fine on March 12 2001 .I got up early that day .All the students in our school went to the hill to plant trees .
　　We arrived at the hill at eight o'clock .The teacher asked each of us to plant at least six trees .Then we started digging planting and watering .
　　We all worked so hard that we could finish our tasks ahead of tim e .Among us Wang Lin our monitor set a good example for us .Though he was ill he worked harder .When he finished his task he went on to help others without even a little rest .
　　He was wet all over after work .I must learn from him I said to myself .Looking at the lines of the young trees we smiled happily forgetting our tiredness .