( ) My mother works _____ a bank . A. in B. on C. at
( )My mother can ______ delicious food .
( )There are _______ days in a week.The ________ day is Saturday .
( )Can I have _______ writing paper ?
( )Walk into your bedroom _________ because your father is sleeping .
( )Every morning Ben’s grandfather ________ for a walk around the lake.