短文改错。

    Holidays are fun but they also give thieves a lot of chances steal____  things.Follow my advice, and you will safe____ during holidays. Even though you might be busy shop____, always notice what is going on around you____. You never know when someone might be trying to steal something from you pockets. Don't forget____  your bag in your car. It's also important to take care of your homes during the holidays.

一物体从斜面顶端由静止开始匀加速下滑到斜面底端，最初3s内经过的路程为s₁，最后3s内经过的路程为s₂，已知s₂﹣s₁=6m，s₁：s₂=3：7，则斜面长度为____m．

某班级要进行一场关于古印度“种姓制度”的历史话剧表演，他们采用的台词应该是(    )

从1956年到1966年,我国在探索社会主义建设道路时期取得的成就是(    )

①石油全部自给   ②开始改变工业落后面貌

③修建了武汉长江大桥   ④第一颗原子弹爆炸成功