(2013·合肥一检)According to the rules and regulations, all payments ________ be made in cash in the shopping center.

Persons under 16 not be employed in our country．

It is uncertain ________ side effect the medicine will bring about，although about two thousand patients have taken it．[ ]

She will tell us why she feels so strongly that each of us has a role ______ in making the earth a betterplace to live on. [ ]

Shanghai is bigger than _____ in Jiangsu and bigger than _______ in China.