To say" It would seem that" instead of saying" I think that" is a common way of using weasel words with using ______.

时间之谜

如果你能够看懂时钟，你就可以知道一天的时间。但是谁也不知道，时间本身究竟是什么。时间是看不到、摸不着、听不见的，我们只能通过记录时间消逝的办法才知道时间的存在。虽然我们成功地测量了时间的分分秒秒，但时间仍然是宇宙间极其神秘的现象之一。

思考时间的一个方法是设想一个没有时间的世界。那样，就不可能有运动了，因为时间和运动是不可分开的。一个没有时间的世界只有在没有变化的情况下才能存在。因为时间和变化是联系在一起的。当某件事发生变化时，你知道时间已经流逝。在现实世界里，变化是永无止境的，有一些变化，如月食，只发生在瞬间，而另一些变化则反复出现，比如日出和日落。人们一直注意那些反复出现的自然现象，在人们开始计算这些现象时，他们就开始测定时间了。

The most important element for an economic system is ______.

Part A

Suppose you have made an appointment with your friend at 5 pm, but you have some urgent business to attend to and have to cancel your appointment. Write a note to your friend:

1) explaining why you have to cancel your appointment

2) making an apology for that

3) telling him/her how you plan to make up for it

You should write approximately 100 words. Do not sign your own name at the end of your note.

Use "Wang Lin" instead.

President Bush grimly warned it will take America years to recover from Hurricane Katrina, but vowed yesterday__________(船只、士兵、医疗必需品、食物和饮料用水已经在送往灾区的路上，这只是联邦政府对这次灾难做出反应的大规模救援计划的开始).

听力原文：Man: Look at the rear-view mirror and the side-view mirror to make sure that no one is coming. You may turn your head to look back, too. Now the gauge on the dashboard says the engine is warm, so you can put it into drive.

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