To our surprise, he behaved _________(装作若无其事的样子).

What is the accurate statement about the pull of the sun on the earth？

Apart from the professional and academic discussions, the obvious characteristics of a workshop __ its emphasis on practical performance.

Smoking is (harm) __ to your health.

You are required to write a letter of invitation according to the following information given in Chinese．

1．发信人：广州贸易公司的杰克

2．收信人：史密斯博士

3．内容：2005年7月26日，杰克代表广州贸易公司的全体员工邀请史密斯博士，在8月8日下午两点到白云宾馆举行的年度促销研讨会上发表演讲。研讨会历时60分钟，50分钟演讲，10分钟的问答时间。预计将有50人出席，大部分为销售经理，其余都有一定的销售背景。

It is said the conference is __ (hold)in this hall next month.