Lucy is shy. She would not invite her classmates _____dancing with her.
--It’s so hot here. Do you mind ____________ the window?---____________. I will do it right now.
My computer broke down, but I am not clear ___________________.
--- What do you think of what I said?--- Sorry. I _____ about something else.
---Why not stop __________ a rest?--- Oh, it’s so exciting that I can’t stop ____________ the model plane.
The house is made ______ bamboo and it is made _______ six rooms.