I'm       about what I say because careless remarks are likely to hurt others' feelings.

---Does Lucy enjoy singing? ---Yes, she does. I have never seen anyone else that is as ________ about singing as she is. 

Upon reading the notice all the staff of the company stood there        ,  looking     at each other. 

A friend has told me about_______restaurant near here.

To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _______ energy.