6、A chemical () is any aspect of a substance which is only seen by means of a chemical reaction (反应).

4、In business, a(n) () president usually reports directly to the president or CEO of the company and is a member of the executive management team.

3、Writing a dictionary is an arduous and difficult task but after years of hard work we are finally ().

2、I’ve conducted interviews and made recommendations, but never been () actual hiring and firing.

1、As the strikers lingered on the streets, refusing to disband (解散), the police finally () using tear gas.

8、Astronauts have brought back ( )of rock from the moon.

7、The dwarf sees farther than the () when he stands on the latter’s shoulder.

6、Our old classroom building, which was built a century ago, has become a sort of a local ().

5、“Do fish () each other?” “Yes. At least many of them do.”

4、() in decades, the leaders of the two nations shook hands and sat down to talk.

3、When you make travel plans, you’d better () that every flight can be late.