1、The children were running on the playground as fast as they can.

改：can-could

解释：主句是过去进行时，从句也应该是过去时，保持一致。

2、Since her husband had died, so she had to support her family.

改：把so去掉。

解释：since表示原因，不需要so再来表示结果。两个词不能同时用在一个句子中。

3、He won't go out until his mother will come.

改：will come-comes

解释：主句是一般将来时，until引导的时间状语从句用现在时表示将来，改为第三人称单数。

4、He was very foolish that he didn't pass such an easy exam.

改：very-so

解释：so...that，如此……以至于。

5、Tom had gone out as soon as his mother got home.

改：had gone-gone

解释：主句用一般过去时。

6、It was three months since he came to our school.

改：was-is

解释：从过去到现在的一段时间，用现在时。

7、The platground of our school is larger than their school.

改：加上 that of (their school)。

解释：操场要和操场作比较，不是跟学校比。用that来指代。

8、The streets in Nanjing are wider than Shanghai.

改：those in (Shanghai)。

解释：街道要和街道比较。用those来指代复数的名词。

Without the country, how can there be home; No home, how can there be you and me. National Day approaching, let us wish of the family Yuan Yuan, everything!

没有国，哪有家;没有家，哪有你我。国庆来临，让我们共祝愿国圆家圆，家和万事兴!

National Day morning when you boot, you can see me on the blessings, one of the hearts of roses, you bring a lifetime of good luck.

国庆早上当你开机时，能见到我对你的祝福，一朵心中的玫瑰，为你带来一辈子的好运。

Meet with you in the fall, the National Day, in early winter long you think Christmas, kiss you have green grass in the spring, the gently just ask you - my first National Day to a better date, okay?

与你相遇在秋高气爽的国庆，想你在初冬漫漫的圣诞，吻你在青草已绿的春天，只想轻轻的问你──-国庆给我一次美好的约会，好吗?

You is my chocolate, I am your chocolate, ah you see more beautiful, you would think her inability. China's National Day, and I look forward to meet you!

你是我的巧克力，我是你的朱古力，见到你啊多美丽，想你想到浑身无力。国庆佳节，盼望与你相聚!

This violent Tadatoshi Akiba of the air, into care, hopefully we care among not only the advent of the National Day holiday period.

把这漫天飞舞的秋叶，化作关怀，但愿我们间的关怀，不仅是国庆佳节来临的时刻。

Guo Guoqing look similar to the takeoff of the people to forge ahead! You kept me fairly well-off to tomorrow!

国庆国庆相亲相近，祖国腾飞人民奋进!你奔小康我来鼓劲，为了明天我们前进!

Filled the air in this ribbon, into concerns sent to your remote. Hopefully we intergovernmental concerns, is no longer coming National Day holiday period.

把这满街飞舞的彩带，化作关切，遥寄给你。但愿我们间的关切，不再是国庆佳节来临的时刻。

The volunteering spirit has spread among the Chinese people in recent years, especially among young people.

Volunteering is of tremendous benefits to both those in need and society. Take the Wenchuan Earthquake as an example. Hundreds of thousands of volunteers play an active role in Wenchuan quake-hit areas. And they contribute daily necessaries, offer medical help and psychological help to the disaster relief work.

Besides, volunteering would be beneficial to the volunteers themselves~ Getting involved in volunteering, volunteers will be exposed to a new environment, and they can learn how to work well in a team, how to improve their interpersonal skills and organizational skills, all of which are critical for their professional growth.

As a college student, I sincerely hope that everyone would join the volunteering work. It is not only good to our society, but also a chance for us to grow and to learn.