Question

          , volunteering is both a chance to help others and a good way to develop ourselves.So you'd better make time to volunteer

1. A.
   To my surprise
2. B.
   To be honest
3. C.
   To start with

Answer 1

B
考查介词短语的辨析。后面内容是对volunteering的解释，属于事实。因此用To be honest (说实话)。