⑴Close the door, please. A.请关门。
⑵Open the door, please. B.请关窗户。
⑶Open the window, please. C.请擦黑板。
⑷Close the window, please. D.请看黑板。
⑸Please clean the blackboard. E.请开门。
⑹Look at the blackboard, please. F.请开窗户。