It took us several hours to make the old man_____ of the safety of travelling by air.[ ]

Leonardo da Vinci (1452-1519) ____ birds kept in cages in order to have the pleasure of setting them free

Of the two sisters, Betty is______one, and she is also the one who loves to be quiet.

Must I finish the paper tonight—No, you _______ finish it tomorrow.

It’s difficult _______ me _________ my diet.