We've listened to his lecture{#blank#}1{#/blank#} many times{#blank#}2{#/blank#} we've learnt it by heart．

{#blank#}1{#/blank#} {#blank#}2{#/blank#} does your sister like？

How do you plan to {#blank#}1{#/blank#} {#blank#}2{#/blank#} these old books?

When I {#blank#}1{#/blank#} {#blank#}2{#/blank#} this morning, the sun {#blank#}3{#/blank#} {#blank#}4{#/blank#}.

{#blank#}1{#/blank#} {#blank#}2{#/blank#}. I'll look after myself well.

Polar bears are in great danger because of {#blank#}1{#/blank#} {#blank#}2{#/blank#}.