用方框中所给词(组)的适当形式填空。每词(组)限用一次。
sure, email，alone， leaf， be good at
【小题1】I'm _______he doesn't come to school today.
【小题2】My little brother always studies hard. He _______all his subjects.
【小题3】The giraffe can eat the_______ on the tall trees.
【小题4】Do you go to school_________ in the morning？
【小题5】How many________ do you check every day？