As we all know, the functions of our skin are very        .

I think you should go back to your          plan, which is much more practical than the present one. 

More ________ information is needed to help us work out the real situation. 

The twins are so much__________that it is difficult to tell one from the other.

 —My son has got a straight A in all his final exams.— What a ____ boy! Congratulations!