{#blank#}1{#/blank#} They watch how the birds fly.

{#blank#}2{#/blank#} They fly like birds.

{#blank#}3{#/blank#} They draw a picture of their flying machine.

{#blank#}4{#/blank#} They want to invent a flying machine.

{#blank#}5{#/blank#} They build the flying machine.

{#blank#}6{#/blank#} Wright brothers like to invents things. One day,they are watching some birds flying in the sky.

① Where is Tom now? {#blank#}1{#/blank#}     A. Yes, I can.

② Is the dog eating? {#blank#}2{#/blank#}     B. He is in the bedroom.

③ Can you play football now? {#blank#}3{#/blank#}     C. No, it isn't.

例：After Chinese class, I have English class.

Before English class, I have Chinese class.