---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.
He worked hard, ______ he passed the exam.
Mr. Brown knows little Japanese, so he can’t understand the ______ on the bottle of the pills.
Travelling in space has been made __________ possible with the development of science and technology.
The book __________ of seven modules ,the seventh of which is revision .
What are you doing out of bed, Tom? You are___________ to be asleep.