根据对话内容，在空白处填入适当的句子、短语或单词，使对话意思完整，通顺。
A: Hello, Jane. This is Maria speaking. Would you like to go hiking with us this Saturday?
B: 1. . But I'm afraid I'll have to go to the library.
A: What about next Saturday?
B: 2. . Let's go hiking then.
A: OK. I hope the weather will be fine then.
B: I am sure it will. 3. .
A. Let's meet at half past seven.
B: Why not make it earlier, 4. .
A: That sounds good. Where shall we meet?
B: 5. .
A: Great! See you then!
B: See you!
