番薯遇到碘酒会变色，这种变色的物质(    )。

根据括号内的汉语提示，完成句子。
(1)She's going to buy some____ (纪念品) for her mother.
(2)____ (幸运地是)，I took an umbrella and didn't get wet.
(3)____(打嗝) loudly is not polite in public (公众的) places.
(4)Thanks for your ____ (邀请) to dinner.
(5)Tom ____ (赢) a prize in the singing competition last week.
(6)John's home is the ____ (远的) from school in his class.

“不应该怨天尤人，会有一个时辰，留给我检点自己！”对这句话理解不正确的一项是（   ）

x=____时，式子$\frac{3-2x}{2}$与$\frac{2-x}{3}$互为相反数.

要控制家里房间内的电灯的亮与灭，在电路中要安装____。