—It _______ be him. He has _______ back to Canada.

Helen is my friend. She is thirteen years old. She is {#blank#}1{#/blank#} (study) in London, the capital city of England. She'd like to visit different {#blank#}2{#/blank#} (place) and meet different {#blank#}3{#/blank#} (people) when she is on holiday. She likes reading very much. Now, she's standing {#blank#}4{#/blank#} (介词) line in a bookshop. She's buying {#blank#}5{#/blank#} (冠词) English storybook.