Her mother gave her that beautiful necklace, which had been ______ from her grandma.

A．she has never cried since she was a baby
B．she is made half blind by the strange illness
C．she often chews her own tongue
D．she is unable to feel pain physically

A．A teacher has to learn by heart what exactly he is going to say in class.
B．A teacher cannot decide beforehand what exactly he is going to say in class.
C．A teacher' s voice must be nicer than an actor' s.
D．A teacher must have a better memory than an actor.