According to the meaning of the sentence and the prompt,fill in the blanks with proper pronouns.
1.He lent me a few books,but _____ of them is easy enough for me.
He lent me a few books,and _____ of them are easy enough for me.
2.Mum,where is _____ schoolbag?I can't find it.
3.Work hard and try _____ best to get the first place in the match,boys and girls.