根据要求完成句子转变。
用适当的介词填空
（1）He was born____ a cold morning.
（2）The girl began to learn to play the piano____ an early age.
（3）The beautiful music was____ Gu Jianfen.
（4）We often watch concerts____ TV.
（5）The boy can play all types____ instruments(乐器).
