用所给动词的适当形式填空。
1. It ______(take) me over an hour to get there yesterday.
2. Andy was not very tired, so he decided ______(not stay) at home.
3. Don't ______(knock) the books off the desks.
4. He was ill because of _______(work) all day and all night.
5. The mother made the poor girl _______(play) the piano for eight hours a day.
6. Thank you for ______(agree) to let me join in the party.
7. Would you please ______(show) me around your school?
8. We always have a great time ______(play) games after school.
9. Taking a bus is much faster than ______(walk).
10. He thought about how______(solve) the safety problem.
，则所给级数的收敛半径R等于（）。