[解析]
81答案:Where are you?该题考查英语交际;根据答语I'm in the supermarket now.可知上句是问爸爸在哪儿;故填Where are you?
82答案:Yes,it is;该题考查英语交际;根据答语It's Father's Day.可知答语为肯定回答;故填Yes,it is;
83答案:Do you have any ideas;该题考查英语交际;根据答语What about spending the day with my grandpa推测上句是询问儿子的意见;故填Do you have any ideas?
84答案:You can buy him a pair of sports shoes;该题考查英语交际;根据问句What can I buy for him?和答语His sports shoes are too old.推测该答语为:You can buy him a pair of sports shoes;故填You can buy him a pair of sports shoes;
85答案:When will you be back?
该题考查英语交际;根据答语I will be back in an hour.可知该句是询问什么时候回来;故填When will you be back?
[点评]
本题考查了"情境对话,补全对话",属于"综合题",根据上下文语境来确定句意,j结合语法结构得出正确答案是解题的关键。