He ______be lazy, but he can work hard when he feels like it．

This book _____ Lucy’s. Look! Her name is on the book. 

一What will the weather be like tomorrow?一It     be rainy ,cloudy or sunny．Who knows? Even the weather report is not always right.

I have two cats. One is black, and ______ is white.

---Whose is the pencil box?---It _____ be Tom’s. Look at his name on the cover!