完形填空Mike is very 1 at maths. Mary, his sister, is not good at it. Mike often helps her 2 her maths. One night Mike and Mary 3 out their exercise—books and began 4 their lessons. Soon Mik
George Gershwin, born in 1998, was one of America’s greatest composers. He published his first song when he was eighteen years old. During the next twenty years he wrote more than five hundred so