用be动词的正确形式填空。
⑴The twins {#blank#}1{#/blank#} babies in 2009.
⑵He {#blank#}2{#/blank#} a little boy now.
⑶She {#blank#}3{#/blank#} four years old last year.
⑷I {#blank#}4{#/blank#} ten years old this year.
⑸They {#blank#}5{#/blank#} going to have a picnic.
