根据汉语提示用which或who引导的定语从句的句子补充完整。

Question

1：I'm looking for the photo__ __ __ __ __ __last year.(我去年在海边照的）
2：We should learn form the girl__ __ __ __ __ __ __ .（总是乐于助人）
3：Have you met a child__ __ __ __ __ __?（戴着红色帽子）
5：Can you sing the song __ __ __ __ __ at present?(最受欢迎的）

Answer 1

1 which I took beside the sea
2 who always like to help other people
3 who wearing a cap of red
4 which is the most popular

Answer 2

which were taken at the beach
who is always ready to help people
who is wearing a red hat
which is the most popular