1．重点单词：unexpected，backpack，oversleep，ring
2．重点短语：leave my keys in the backpack，go off，wake up，at least，give...a lift，by the time...
3．重点句式：
Life is full of the unexpected.
By the time I got up，my brother had already gotten in the shower.
Before I got to the bus stop，the bus had already left.
Carl's dad saw me on the street and gave me a lift in his car.
