语法填空,阅读下面材料，在空白处按要求填入适当的单词或括号内单词的的正确形式（每空一个单词）
My name is Sam. Welcome to       classroom. I love it very much because it is very big_______  beautiful. There are twenty   ____ (desk) and chairs here. There is a big blackboard _______ the wall, and I like to draw ______ (picture) on it. Can you see a pencil and _______ pen on the desk? They        （be）mine(我的). There is a        (篮球) under the chair. I like        (play) it with my friends after school. It’s my    （最喜欢的）sport.