It was Sunday。 Mary went to a park by bike to play。 She arrived there at 11:00。
Ten minutes later， she went to the lake。 The lake was very beautiful and some boys swam in the lake。Mary enjoyed the natural scenery and didn"t know that there was a thief near her。
After five minutes， the thief stole Mary"s bike away quietly。 At 11:20， Mary came back and looked for her bike， but she couldn"t find it and very worried。She cried and ran to the pay-phone。
She called the police and wanted the police to help her。