It is enough to introduce a range of different activities into a lesson to keep the students interested in learning English.（）

In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.

In the past 50 years, there ______ a great increase in the amount of research ______ on the human brain.

In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.

The explosive range of a mixture of flammable vapors is specified as a percentage of （）.

The international number，location and/or name，geographical co-ordinates，characteristics and intensity，elevation in metres，range in sea miles and description of structure of a light can be found in（）.

A slow and easy motion of a vessel in a seaway is an indication of a（）.

A quick and rapid motion of a vessel in a seaway is an indication of a (n)（）.

A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.

In order to prepare a lecture, one must do a lot of research and spend plenty of time _____ his material so that his speech is clear and easy to follow.

Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). You have two global groups named Research and ResearchManagers. The Research group contains all users in a department named Research. The ResearchManagers group contains all managers in the Research department. All members of the ResearchManagers group are members of the Research group. You create a shared folder named Research. The permissions for the Research share are shown in the exhibit.(Click the Exhibit button.) You need to modify the share permissions to ensure that only members of the ResearchManagers group can add and modify files over the network. What should you do? （）

Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). You have two global groups named Research and ResearchManagers. The Research group contains all users in a department named Research. The ResearchManagers group contains all managers in the Research department. All members of the ResearchManagers group are members of the Research group. You create a shared folder named Research. The permissions for the Research share are shown in the exhibit. (Click the Exhibit button.) You need to modify the share permissions to ensure that only members of the ResearchManagers group can add and modify files over the network. What should you do? （）