①six {#blank#}1{#/blank#}             a. 10

②ten {#blank#}2{#/blank#}                b. 7

③eight{#blank#}3{#/blank#}              c. 9

④nine  {#blank#}4{#/blank#}            d. 8

⑤seven {#blank#}5{#/blank#}         e. 6

 {#blank#}1{#/blank#}

How many ?

①Teachers'Day is on the {#blank#}1{#/blank#}of September．

②Three plus six is{#blank#}2{#/blank#}．Twenty—five minus(减){#blank#}3{#/blank#} is seventeen．

③W is the{#blank#}4{#/blank#}letter in the alphabet(字母表)．