Many people can not learn any lessons from the mistakes____they get hurt somehow.

Nobody believed his reason for being absent from class__________he had to meet his uncle at the airport.

There was so serious a matter that I had no choice but _________ the police.

ildren loved their day trip, and they enjoyedthe horse ride___

Oh，my God! It’s a sea of bike，How Can you your bike?—That’s easy．My brake went wrong , besides I tied a red ribbon to it.