Listen! His family must be quarrelling, ____?
As a father of three children, I need a job ______ so that we can survive.
In China’s countryside, villagers often have the same family name, but _______ not be closely related.
______ makes the school proud is_______ most students have been admitted by the key universities.
Can you imagine what problem may ______ when human beings are cloned?
I’ll bring some medicine just _____ some of us get sick while travelling.