Answer:
1. Birds can fly, can't they?
2. He left the hostel, didn't he?
3. Nobody admits him, isn't it?
4. Please help me, will you?
5. They visited Singapore, haven't they?
6.No one went there, didn't they?
7. Bring me a pen, will you?
8. Come here and sit down, will you?
9. Everybody will help you, won't they?
10. Mr. Halim is a teacher, isn't he?
11. Neither of them is guilty, aren't they?