【2015·安徽】They gave money to the old people's home either ______ or through their companies.
_____ might be expected, the response to the question was very mixed.
Living in the central Australia desert has its problem, _____ obtaining fresh water isn’t the least.
All _____ is a continuous supply of the necessities of life.
We need a chairman _____.
_____ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.