Trắc nghiệm: I’m afraid very few people know about the concert and almost no one will come. If only the posters  _____________ on time.,I’m afraid very few people know about the concert and almost no one will come. If only the posters  _____________ on time.,I‟m afraid very few people know about the concert and almost no one will come. If only the posters _____________ on time,I‟m afraid very few people know about the concert and almost no one will come. If only the posters _____________ on time.