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

To make room for teachers’ correction, the students had better write their composition ______.

1. A.
   every two line
2. B.
   every second lines
3. C.
   every the second line
4. D.
   every other line

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 that you ________ all the doors and windows when you leave the room．

1. A.
   will shut
2. B.
   would shut
3. C.
   shut
4. D.
   have shut