按要求完成下列英语句子,每空一词
1.She thinks it's safe to go across the street now (变为否定句） She( ) ( )it ( )safe to go across the street now 2.It takes us (three hours) to ride to the mountain (对括号里的内容提问） （ ） （ ） （ ）it( ) you to ride to the mountain