in is the largest organ of your body______of three layers; _______are essential to _____your body against diseases,poisons and the sun’s harmful rays or radiations.

Have you decided where to spend yoursummer holiday—Not yet. We ___ go to Hong Kong.

下列字母中全部是元音字母的是__________.

Maybe you have been to many countries, but nowhere else _______ a more beautiful palace.

The skin, an ____ part of your body and its largest organ, ____ as a barrier against diseases.[ ]