题目

★ Can you swim well? Are you free on Saturday and Sunday? Our club needs a swimming teacher to teach children (孩子) from 8 to 10 years old. It is interesting to be with them. Please call Leo at 5968-4437. ★ Are you busy after school? No? Can you speak English? Yes? Then we need you to help some American (美国的) students. They study in Beijing. They can’t speak Chinese now. They are friendly and you can make friends with them. Please email Mr. Liu at helpingus@gmail.com. ★ Can you play the guitar or the drums? Do you have time this Wednesday? Our music club will have a pa鞋店上午卖出皮鞋18双，下午卖出同款皮鞋23双，下午比上午多收入420元。每双皮鞋的售价是多少元？