I can’t find my pen. Could you help ________ find it?

Come on, boys and girls. Help ____________ to all the yummy food. 

My sister is only four years old, but she can look after ________ now.

---Mr. Black, I find  ______  difficult to play the piano well.---Oh, I think you just need to practice more  

 Eddie is eight years old, but we have seven candles, we need _____ candle.