The ________ needle was invented, which allowed physicians to inject and extract liquids to and from a patient's body

A return address for the sender should always be placed in the ________ corner in the event the letter must be returned to the sender.

A. bottom right-hand B. upper right-hand C. upper left-hand D. bottom left-hand

From the proximal view the first premolar is about ____________________ wider than when viewed from the buccal.

Fill in the blank(s) with the appropriate word(s).