Misc: what government position is held by the resident of 11 downing street, london?

Questions

Of the twenty brightest stars in the sky, what one is the furthest north?

Of what battle was a horse named Comanche the only losing survivor?

Offered a new pen to write with, 97% of all people will write what?

Often drank, this liquid is normally harvested from female cows?

Ogdensburg, New York is the only city in the U S situated on what river?