下列单词画线部分读音不同的一项

Having won the first place in the English examination, Tom ran back home,

____ it snowed heavily yesterday, nobodyin our class missed the lesson． A．Though

On his way home, he found a wallet ____ on the ground,which he picked up and ____ in his schoolbag.

Tim’s mum is worried _______ her son’seyesight as he plays online games too much.