小福认为我国不论是国防建设，还是其他各项建设，都在沿着一条正确的道路前进。这条道路是（    ）

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).