I will smile./I can gesture when I am talking on the phone. (答案合理即可)
题干:当你打电话的时候,你会怎么做让你的声音听起来很友好?
根据第二段For example, if you smile, your voice will sound warm and friendly(例如,如果你微笑,你的声音会听起来温暖和友好)以及第五段When you gesture, you bring more air into the lungs, which can make your voice sound warmer.(当你做手势时,你把更多的空气带入肺部,这会让你的声音听起来更温暖。)可知,打电话时,微笑和做手势都可以让声音听起来很温暖友好。所以参考答案为:I will smile./I can gesture when I am talking on the phone. (我会微笑。/我打电话的时候可以做手势。)
开放性问题,言之有理即可。