4、__________20.打开书本______________三、选择正确的序号填入括号中。()1.--Lookattheblackboard.--_______________.A.I’msorry.B.Yes,MrGreen.C.It’snice.()2.Isthis_______Englishbook?AIByouCyour()3.Iliketo_______juice(果汁).A.eat B.drink C.run()4.It’stoocold(冷)._______thewindow,please. A.Don’topen B.