选词填空，补全句子。
yours hers ours mine
【小题1】This is your eraser, where is __________ ?
【小题2】Your classroom is clean, __________ is clean, too.
【小题3】------ Is this Sarah’s new bike?
------ No, __________ is yellow.
【小题4】My pencil-box is too small. What about __________ ?