Theories are tested by _______ practice

她努力工作，以便8点能把一切都准备好。

内容：写一封信给某网上销售公司，投诉你在网上购买的CD播放机迟迟没有寄来，昨天收到后又有质量问题，不能正常播放，建议该公司改进服务质量，并要求退换有问题的CD播放机。

我已尽了我最大的努力，因此如果我失败，我并不觉得有什么羞耻的。

他确保同样的错误以后不再发生。

他们坚信只有通过刻苦和努力，人们才能完善自己并为自己赢得更加美好的未来。

这一项目的失败使我们得出结论：我们过高估计了他的能力。

Even the busiest government official or executive always takes extra time to be polite and offer refreshments(茶点).

Complaining is usually most effective when it is done politely but firmly, and especially when the consumer can demonstrate what is wrong with the item in question.

Tender Forms will be available up to 4: 00 p.m. on February 15, 2004.

It is understood that when two unions quarrel over three jobs, the argument is settled by giving each union two. That means 33 percent over manning, 33 percent less productivity than could be obtained.