用适当的介词填空(1)He was born{#blank#}1{#/blank#} a cold morning.
(2)The girl began to learn to play the piano{#blank#}2{#/blank#} an early age.
(3)The beautiful music was{#blank#}3{#/blank#} Gu Jianfen.
(4)We often watch concerts{#blank#}4{#/blank#} TV.
(5)The boy can play all types{#blank#}5{#/blank#} instruments(乐器).