.Without any doubt, depression________can create a variety of negative health effect.

I told him it was a bad idea,but Dave’s so __________ that he just never listens.

Air is________and of no smell but we can feel its motion when there is a wind. 

Most experts agree that washing hands regularly is a ______way to prevent the spread of many diseases.

—Is the parking space ________ for all the cars in the community?—I’m afraid not, only about half.