'Have had' should be used when talking about yourself. 'I have had that.' It can also be used when talking about a group. 'They have had that.' 'Has had' is when talking about another person. 'She has had that.' (Sorry about to horrible examples, I'm too tired to sit and think of good ones)
the answer is 0.
use a sit and reach test
use a sit and reach test
It would be good, if you keep lifting your feet off the ground.
If they are visiting, ask them if they would like a seat. If the occasion is an interview, it is nice to point out where they should sit and ask them to "Please take a seat."
pull your pants down and sit on the toilet and push really hard
You should sit within 3 feet of the lens.
This question does not sit well with me.
That really depends upon how compliant your child is. In general five is a good age for a haircut, but you can use trimmers to shape it up . Every child is a little different when it comes to there development. I would think taht by the time your son is 9 or 10 years old he should be ready to sit still for a haircut.
You should use plastic only spray paint for them and then let them sit over night.
Sat is the past tense of sit.