–You seemed to have been impressed by his songs.--Well, not exactly so. It was his way of singing _____his voice that really impressed me.

She devoted herself___to her research and it earned her a good reputation in her field.

---- Do you think it’s a good idea to make friends with your students? ----        , I do. I think it’s a great idea.  

--___do you clean the reading room? ---Every two or three days.

The new machine, as is reported in the local newspaper, will work twice as fast, _____ greatly reducing costs.