Dr Grover Krantz, studied reports of such strange creatures for many years. He {#blank#}1{#/blank#} {#blank#}2{#/blank#} they exist.

They have to have a basic understanding of computers {#blank#}1{#/blank#} the advanced technology. 

 It's quite an informal party so we needn't dress up for it.In fact,we just {#blank#}1{#/blank#}to eat,drink and have fun with each other.

This train will {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}there in time.