Some little boys have difficulty ______their hearts into the lesson for a long time.

I’ veusing plastic bags when shopping. — You’ re right. It’ s good for our environment.

Lucy is not _____ good at sports _____ Kate.[ ]

I like your pet dog very much. But I can’t find _______ in the pet shop. Where did you buy _______?

We were swimming in the lake _____ suddenly the storm started.