Mr Hu, can you tell us how to learn math well?—Sure. But remember nothing can be learned _______ hard work. [ ]

All the club members _______ the floor when they heard someone _______ for help.

I’ll do it better if my mother _______ me to try one more time.

Do you know if he ___to our party? —I think he will if he ___free tomorrow.

There are some trees ______ our classroom. [ ]