阅读下面短文 , 按照句子结构的语法性和上下文连贯的要求 , 从 A 、 B 、 C 和 D 项中选出最佳选项。 Hello! I'm Mrs Smith. Here 1 some lost things( 东西 )._ 2 are in the lost and found box. This is 3 eraser. It is blue. David found it this morning. That is a jacket. It is yellow and black. Alan found it this afternoon. 4 jacket is it ? Is it yours? Those are two pencils. One is blue. 5 is red. Mary found them in 6 classroom. By the way, Jack is looking 7 his key. It's a white key. He must find it. Can you 8 Jack? Boys and girls, if( 如果 )you lose something, you can ask me 9 help. Call me. My phone number is 887-9006. Please be 10 with your things from now on.