I have some boxes. One is small . It's blue . One is full of books .It's red. The third is new. There is nothing in it . There are some old bottles in a big blue box. Today, I want to put the red box in the car, but I can't carry it. My mother helps me. And she can put the box in the car. The red box is   _  ,so I can't carry it.
heavy light old small