21. —would you mind if i turned off the radio? —____it makes no difference to me. a . never mind b. sure, go ahead c. not at all d. why not 22. he was ____by his brother. a. brought up b.brought down c. brought in d.brought on 23.a dog____at his master's gate predicts the ruin of the state. a. skilling b.stoping c. starving d.smelling