[解析]
(1)由I'm so excited.(我太兴奋了。)可知,此处说明兴奋的原因。选项E.Winter holiday is coming.(寒假就要到了。)符合。故选:E。
(2)由Oh!It's hot.(哦!天气很热。)可知,此处说明季节。选项A.It's summer there.(那里是夏天。)符合。故选:A。
(3)由I'm going to swim in the sea.And I can eat ice cream,too.(我要去海里游泳。我也可以吃冰淇淋。)可知,此处询问对方打算做什么。选项D.What are you going to do there?(你打算在那里做什么?)符合。故选:D。
(4)由Sure.It's far.(当然。很远。)可知,此处提到交通方式。选项B.Are you going by plane?(你坐飞机去吗?)符合。故选:B。
(5)由I'm going to Harbin.It's snowy.(我要去哈尔滨。下雪了。)可知,此处补充说明自己打算做什么。选项C.I'm going to ice﹣skate.(我要去滑冰。)符合。故选:C。