从Ⅱ栏中找出能应答Ⅰ栏中句子的选项，并将其序号填入题前的括号内。(共5小题；每小题1分，满分5分)
We go ______ a picnic in May. A.to B.on C.for
My sister _____ to school in the morning. A.is walking B.walk C.walks
Let us _______ ball games. A.playing B.are playing C.play
Let’s go _____ there together. A.at B.to C./
Look ______ my new bag. It is big. A.at B.in C./
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