他的演讲引发了全场热烈的讨论。

His speech ___sparked a lively discussion among the audience.

短路的电线突然迸出危险的火花。

The short-circuited wire suddenly ___sparked dangerously.

他的演讲激发了观众的热情。

His speech ___sparked enthusiasm among the audience.

他的演讲引发了学生们对环保问题的热烈讨论。

His speech ___sparked a lively discussion about environmental issues among the students.

当电线短路时，它冒出了火花。

The short-circuited wire ___sparked when it malfunctioned.