从方框中选择恰当的单词填空，使短文意思完整。 where,  some,  chair,  set,  and,  on,  plants,  alarm clock,  they,  what This is the bedroom (卧室) of Alan. It is clean (干净的). There are (有) 1_____ pictures on the wall (墙). There is a 2_____  of keys and an 3_____  on the desk. His backpack is on the 4_____ . His jacket is 5_____ the bed. 6_____ are his video tapes? 7_____  are in the drawer. 8_____  are those on the sill (窗台)? Oh, those are 9_____  and flowers (花). 10_____  where's his math book? It's in the bookcase.