1. There are many in the .
2. Please . The shop at nine thirty.
3. Please here and stand in .
4. My mother in the library. She is a .
5. Don't in the .
6. English isn't to .
7. Please me your library .
8. We should in the library.

【解析】：这是一道英语填空题，需要根据给出的首字母或中文提示，补全句子中的空白处。题目考查的是对英语词汇的掌握以及上下文的理解能力。解题的关键在于准确理解每个句子的意思，并结合首字母或中文提示，推断出应填入的词汇。
【答案】：
1. There are many rules in the library.（图书馆里有很多规定。）
2. Please hurry. The shop closes at nine thirty.（请快点，商店九点半关门。）
3. Please come here and stand in line.（请来这里排队。）
4. My mother works in the library. She is a librarian.（我妈妈在图书馆工作，她是一名图书管理员。）
5. Don't talk in the class.（不要在课堂上讲话。）
6. English isn't easy to learn.（英语不容易学。）
7. Please show me your library card.（请出示你的借书卡。）
8. We should keep quiet in the library.（在图书馆里我们应该保持安静。）