根据短文内容，填写所缺单词或用所给单词的正确形式填空。
Have you ever been to the school's lost and found office? It is always filled
1. many items, small things like pens and notebooks, and bigger ones
such as bikes and coats. This old storybook on the shelf must belong to John. His
full name 2. (write) clearly on the inside cover.
The silver bike near the office can't be 3. (Mary). She has repeatedly
told her classmates she doesn't like riding bikes. "Whose black pen is this on the
desk?" Ms. Green asked, 4. (hold) up the pen. One student said it
5. (may) be Tom's because he has a similar one, but he wasn't sure,
because black pens are so common in class.
The light brown leather bag on the hook(挂钩) could be Lucy's. She often
carries 6. bag like this to school, and the brown is her favorite color.
That bright red coat in the corner 7. (can) be Linda's. Her favorite color
is blue, and all her outerwear(外套) is blue. These watches on the shelf are from
the nearby park, some with grass stains(草渍) on the watch bands(表带). There
are also three leather wallets, each with a few coins. The cat-patterned notebook is
8. (sure) Lily's. She showed it to us last week. "Are these new pens yours,
Mike?" Ms. Green asked. Mike shook his head, "No, 9. (I) are in my bag."
I found two folding umbrellas by the classroom door this morning. Now
they're here, waiting for their 10. (own).

1. with 2. is written 3. Mary's 4. holding 5. might 6. a 7. can't 8. surely 9. mine 10. owners

1. 考查固定搭配be filled with，意为“充满、装满”，故填with。
2. 考查一般现在时的被动语态，主语His full name和动词write是被动关系，主语为单数，故填is written。
3. 考查名词所有格，此处表达“玛丽的（自行车）”，需用Mary的所有格形式，故填Mary's。
4. 考查现在分词作伴随状语，句子已有谓语asked，此处动作是主语Ms. Green发出的伴随动作，故填holding。
5. 考查情态动词的时态，主句谓语said为一般过去时，从句的情态动词may要变为过去式，故填might。
6. 考查冠词，此处泛指“一个这样的包”，bag以辅音音素开头，故填a。
7. 考查情态动词表否定推测，根据后文“她最喜欢的颜色是蓝色，所有外套都是蓝色”可知这件红外套不可能是Linda的，否定推测用can的否定形式，故填can't。
8. 考查副词，此处修饰整个句子，表达“毫无疑问、肯定”，需将形容词sure变为副词形式，故填surely。
9. 考查名词性物主代词，此处指代“我的钢笔”，后面没有名词，需用I的名词性物主代词，故填mine。
10. 考查名词，形容词性物主代词their后接名词，此处表示“它们的主人”，两把伞对应复数主人，将own变为名词复数形式，故填owners。