look __ the tennis ball ___ the floor,Is it Li Ming's?(填介词)

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look __ the tennis ball ___ the floor,Is it Li Ming's?(填介词)
look __ the tennis ball ___ the floor,Is it Li Ming's?(填介词)

look __ the tennis ball ___ the floor,Is it Li Ming's?(填介词)
look at sth.
on the floor.
看地上的网球,是李明的吗?