I’m sorry, I_________ the book in my home.

Look at the sky! What is it?—Oh! _______UFO is landing on the ground.

_____ has your brother studied in New York? —For two years. [ ]

He went to Shanghai ___ September 3, 1991 and came back ___ a cold morning last year. [ ]

After a knock at the door, the children heard his mother’s voice him．