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

 It’s ______ to sign up for the cooking contest when you can’t cook a meal by yourself.

It is really_______ to take a walk along the peaceful country road. 

Some experts argue that the reason why the price of houses can’t drop is that the supply is not ______ to the demand.

 —Are you satisfied with what he did？　　—No， it couldn’t have been ______.