-- No, they're shorts.  

-- It's Jack's.

—______.

—I learn it by working in pairs.

⑴Did you buy some water ?{#blank#}1{#/blank#}             A、I helped my mother .

⑵What happened to your head ?{#blank#}2{#/blank#}     B、They are my grandparents .

⑶What did you do last Sunday ?{#blank#}3{#/blank#}      C、No , I wasn't .

⑷Were you at home yesterday ?{#blank#}4{#/blank#}      D、No , I didn't .

⑸Who are they , Lingling ?{#blank#}5{#/blank#}               E、I fell off my bike and bumped my head .