Make sure that your computer room is 100%________of insects because they can really cause trouble to your machine.

 Make sure that your speech is _________ and to the point, so that the audience will not get bored just because they have to listen to you talking for a long time.

Make sure that the machine is kept where it is not ____ to children.

   A. possible      B. common          C. accessible                D. Useful

Make sure that the lighting is________so that your guests can see what they are eating.

A．unique 　　　　　　　　　　　 B．essential

C．adequate 　　　　　　　　　　 D．ambiguous

Make sure that the machine is kept where it is not ______ to children.

1. A.
   possible
2. B.
   common
3. C.
   accessible
4. D.
   Useful