It is obvious to the students _____ they should get well prepared for their future. [ ]

Recent campus tragedies show thatsafety measures are so important that we _______ take them too seriously

What I like about Harvard is ________ there’s the old classical look—there are parks and traditional buildings

If you lose a customer, regret it _____ excuse it, or you will lose him for ever

hinese people are kind and caring. If not, I _____ in China in the past 30 years.