根据图片完成对话
A: What's this?
B: This is {#blank#}1{#/blank#}.
A: What color is the flag?
B: It's {#blank#}2{#/blank#}.
A: How many {#blank#}3{#/blank#} are there on the Olympic Flag?
B: {#blank#}4{#/blank#}.
A: What color are they?
B: They are {#blank#}5{#/blank#}.
