_______ the age of four, he started to learn the piano.[ ]

He is believed____________ in at his office on his way home.

____ has been heated discussion over which country bakes the world’ s best pizza: Italy, where pizza began or the US, where it was globalized.

You’d better wear a pair of comfortable trainers when ________a long walk.

I don’t doubt _____ for the journey by doing jobs on the ship.