Clues to a crossword puzzle

Hi,

I am trying to write some clues to a crossword puzzle. How should I write for the word/object "pencil"? Are these varieties correct?

Different variety of clues for the word "pencil":

You usually write with this.

You usually use what to write.

You usually write using what?  

I am trying to write some clues to a crossword puzzle. How should I write for the word/object "pencil"?

It depends how difficult the puzzle is designed to be.

Crossword clues to elicit the word pencil.

1.  _______  thin moustache.

2.  Provisionally schedule (with "in")

3.  A kind of cactus.

4.  It can be tucked behind the ear when not in use.

5.  A red one may be used to correct you.

6.  styptic and eyebrow are two types

7.  Something no longer to be used when the exam has finished.

8.  It contains no lead, but won't work without lead.

9.  It is held upside-down to remove its effects.

10.  Graphite is central to this tool.

CJ