Are you familiar(熟悉) with the music?— Yes. There was ______ time _____ this kind of music was quite popular. [ ]

Sometimes I keep my feelings to myself it’shard for someone else to understand.

Why do you ____ the radio I can’t hear the light music clearly.—I’m afraid of waking the baby up.

don’t know why you are so concerned — it’s not your problem _____ .

I’m sorry, I shouldn’t have been so rude to you.—You something not very nice to me, but that’s OK