682－375= ____ 243－156=____
哥伦布从西班牙向西航行到西印度群岛，途经的大洋是（ ）
对于老师的缺点与错误，学生应当采取的正确态度是( )
—Amanda, you look tired today. What's wrong?—I worked______ late ______ I didn't go to bed until midnight yesterday.
