Unit 3Is this your pencil,Part 6 Self-check 自我检测，综合提升,book,schoolbag,eraser,whose,excuse,dictionary,thank,about,computer,game,notebook,library,watch,baseball,classroom,A,D,B,C,B,D,C,B,A,D,G,D,C,F,B,Mike,In the afternoon,In the library,353-9495,Many students often lose things. For example, Lucy lost her schoolbag in the library yesterday. Alex lost his football on the school playground. I think they are not careful enough. I will give you some advice about how to keep our things carefully. First,
