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

To make sure of your success in the coming speech contest, first of all you should know your_____

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

1. A.
   absent
2. B.
   rare
3. C.
   free
4. D.
   short

Make sure you read the ________ before using any piece of electric equipment．

1. A.
   conditions
2. B.
   directions
3. C.
   situations
4. D.
   applications

Make sure that you keep your boss _________ the fresh developments by e-mail.

   A. informing of     B. inform of            C. informed of          D. to inform of