根据中文提示, 补全句子。
1．Sam is a handsome boy. He often ________（打扫）the blackboard for us.
2．His father ________（停止）drinking wine（饮酒）three years ago.
3．There was a river in my hometown ________ ________（很久之前）.
4．—Do you often play basketball?
—Yes, of ________（当然）.
5．He always ________ ________ ________ ________ ________（骑自行车去上学）.
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