________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
Tom as well as his friends _____ to visit our school soon after they arrive in Changsha.
_____ is the first thing to consider when customers buy certain goods.
He has lost the key to the drawer _____ the papers were kept.
I’m very tired now but _____ I must finish the work today.
Many lifestyle patterns do such _____ great harm to health that they actually speed up _____ weakening of the human body.