1. 다음 글의 밑줄 친 부분 중, 어법상 틀린 것은?
some of the things we have to do ①are tiring and annoying. we must do many of these things regardless of ②how we feel about them. doing the dishes day after day can be a tiring job, but no matter how much we hate it, it must ③do sooner or later. however, chores like this can actually be enjoyable. perhaps dish washing is a time for listening to music and ④singing along. also, it can be a time for conversation between family members as we help one another. if we try to look for the ⑤hidden treasures and opportunities in tiring and annoying jobs, they will never fail to reward us.여기서 3번이 틀리고 be done 으로 고쳐져야 하는 것 맞나요?