下列句子中，全是通假字的一项是(　 　)

you read when the power is off ? It’s harmful to your eyes . [ ]

Letter boxes are much more in the UK than in the USA, where mostpeople have a mailbox instead.[ ]

The charity show was very successful with the help of all the classmates, just as the old saying goes, “_______.”

A: David, remember to turn off the lights before leaving the house.B: ________