Are you going to {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} the discussion.

I felt nervous {#blank#}1{#/blank#} the exam began.

I {#blank#}1{#/blank#}you when you knocked on the door.(be about to do) 

All the students{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} will have the chance to travel to the Great Wall. 

①My farm has expanded into a big one,which is {#blank#}1{#/blank#}the previous one.(as...as...)

②My farm has expanded into a big one,which is{#blank#}2{#/blank#}the previous one.(倍数+比较级+than)