选择适当的介词填空。

(1)Kate is ________ America. Now she is ________ Beijing.
(2)I can't sit ________ Sarah. She is so tall. I can't see the blackboard.
(3)— Are these cakes ________ me?
— No, they aren't.
(4)— What's this ________ English?
— It's a watch.
(5)— Who's that boy ________ blue?
— He is Mike.
(6)It's time ________ get up. I often get up ________ six.
(7)Who's ________ duty today?
(8)Lucy is studying ________ the classroom.
(9)Put ________ your shoes, please. It is time ________ PE class.
(10)I often do my homework ________ the afternoon.