—Yes, I {#blank#}1{#/blank#}(碰巧看见他) in the science museum yesterday afternoon.

Peter asked me {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} him.

He is my{#blank#}1{#/blank#} {#blank#}2{#/blank#} .

Yesterday we {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}at school.

When I got there, the tickets {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}.

When we meet some difficulty in learning, we can {#blank#}1{#/blank#}.