From his _______expression, we can guess that the problem maybe was quite _______.

Don’t be too general. Please give a ________suggestion on how to deal with this difficulty. 

—Mum,  why have us eat much vegetable? —Because it is _____ to our health. 

I’m afraid I’m not ____ to help with the show, for I am fully occupied with my own project．

The goods bought on line are _________ than those bought in stores.