By boat is the only way to get here， which is _______ we arrived．（　　）

Kids shouldn't have access to violent films because they might _______ the things they see．（　　）

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

It's strange that he _______ have taken the books without the owner's permission．（　　）

Developing the Yangtze River Economic Belt is a systematic project which _______ a clear road map and

timetable．（　　）