If you have questions, you should ask the teacher _______ help.

In August, Typhoon Morakot swept across Taiwan Island, ________ a lot of villages ________. [ ]

I wonder how he _____ that to his grandmother who brought him up. [ ]

incipal walked onto the platform and seatedhimself in a chair, ____ for answering questions

Mary_______ not ride a bike in the past,but now she_______ do it.