What Am I Riddles

Question: What is bought by the yard by is worn by the foot?

Question: I'm measured in temperature and time, but have neither.

What am I?

Question: I build bridges of silver and crowns of gold.Who am I?

Question: There are several different kinds, but the one you pick doesn't do its job.

What is it?

Question: What do you use to hoe a row, slay a foe, and wring with woe?