The skin is an essential part of your body and is ____ you feel cold, heat or pain.

Wouldn’t it be nice if students had to go to ________ school only four days ________ week

____ 1960s, ________ number ofhabitants here is very _______ ,and it was since the middle of 1970s that thepopulation has been increasing rapidly

Oh, dear! I forgot the air tickets　 —You ______ something　

What would you like to drink， tea or coffee— ____________ is OK. They are both my favorite.