Read the passage and choose the best answer A, B, C or D.Last Saturday, our school organized a charity event to raise money for children in difficult circumstances. At 8 a.m., many students __1__ in the school yard and prepared the activities. While some students __2__ the booths, others were decorating the stage. At around 10 a.m., the principal __3__ the event with a short speech. While she was speaking, everyone __4__ carefully. Later, I __5__ some handmade products with my classmates.