---Does tiredness or inadequate sleep cause dark circles under eyes?---Lack of sleep will _______ making your skin look pale, and this will make your circles look darker.

—Xiaoming, you are late again, can you tell me why?—I was on the half way when it _______to me that I had left my notebook at home, so I have to fetch it.

“This month our family has used ______ water as we did last month.” said Mother .

___ century has just gone by and we’re now in a new century.

Such _________ the case, I couldn’t help but _________ him.