She can't find her pen.She 's looking _____ it.

She can't find her pen.She 's looking _____ it.
She can't find her pen.She 's looking _____ it.

She can't find her pen.She 's looking _____ it.
She can't find her pen.She's looking for it.

for
look for......寻找.......

look for 寻找

填for
look for 寻找（强调找的动作）
而find强调结果