-----What do you think of Harry, our new roommate?----- I am not sure, but he is always asking _____questions.
Their cheerful voice showed that they were doing ___ .
My students are all quiet.Even after class, my students spend ___as they can playing outside.
The song sounds ___ .doesn’t it?
All these are matters __ attention.
The sudents were silent as they saw the ___ look on their teacher’s face.