I felt it hard to keep up with my classmates. But when I want to _____, my teacher always encourages me to work harder.

I know she is very ______ . Look! The smile(微笑) is on her face.

Everyone likes to buy things ______ a good price.[ ]

The boy is _______ my sister, so he sits in front of her.

We know the boy ______.He likes the music________.