Category: kids in the hall: the kids discovered this to be the cause of cancer?

Questions

a good typist can strike ---------- keys in a second?

a ---------- is the object most often choked on by americans?

a typical double mattress contains as many as ---------- house dust mites?

according to one study, ---------- of lawns have some sort of lawn ornament?

all 50 ---------- are listed across the top of the lincoln memorial on the back of the $5 bill?