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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