I don't know{#blank#}1{#/blank#} he is at home {#blank#}2{#/blank#} at the office．

My father is{#blank#}1{#/blank#} {#blank#}2{#/blank#}my mother．

{#blank#}1{#/blank#}

    People used to like big cities, but now many say that they are interested in living on a farm. It's a good way to get close to nature. The number of farmers under 35 years old in the US is increasing. These farmers like to run small farms.

{#blank#}1{#/blank#} this is Nick's best novel to date.

= This {#blank#}2{#/blank#} {#blank#}3{#/blank#}Nick's best novel to date.