1、 By boat is the only way to get here, which is _______ we arrived.

2、 Kids shouldn’t have access to violent films because they might _______ the things they see.

3、 Self-driving is an area _______ China and the rest of the world are on the same starting line.

4、（填空题） 数学填空题

5、（填空题） 过点(0，-2)与圆x²+y²-4x-1=0相切的两条线的夹角为α，则sinα=