[解析]
(1)A骑自行车,B乘地铁,C步行。根据On Saturday morning,I walked to Renmin Park with my sister.(在周六早上,我和姐姐走着去了人民公园。)可知小明步行去的人民公园。故选:C。
(2)A周六上午,B周六下午,C周日下午。根据On Saturday morning,I walked to Renmin Park with my sister.In the afternoon ,my sister and I visited our grandparents.(在周六早上,我和姐姐走着去了人民公园。在下午,我和姐姐去看望我们的祖父母。)可知在周六下午,小明去看望他的祖父母。故选:B。
(3)A一些杂志,B一个书包,C 一些故事书。根据I bought some storybooks.(我买了一些故事书。)可知小明在书店买了一些故事书。故选:C。
(4)A在体育馆里,B在公园里,C在操场上。根据After lunch,I went to the gym and played sports there.(午饭后,我去了体育馆并且在那里做运动。)可知小明在体育馆里做的运动。故选:A。
(5)A他看电视并打扫房间。B他看电视并画漫画。C他做作业并打扫房间。根据In the evening ,I watched TV and cleaned my room.(在晚上,我看电视并打扫房间。)可知在周日晚上,小明看电视并打扫房间。故选:A。