A．You consider that you owe somebody a letter.
B．You consider that letters are gifts.
C．You consider that writing letters makes you feel cheerful.
D．You should feel ashamed that you haven’t answered a letter.

A．His interest in watches was strong because his father was a watchmaker.
B．His interest in watches grew because he had to repair watches when he was in the army.
C．His interest in watches started at school.
D．His interest in watches is lifelong.