In each of the sentences below, choose the best option to form a complete sentence.

While his overall professional performance has been adequate______

A. , his poor communication skills

B. and therefore acceptable

C. , his communication skills could improve

To improve your health, participate in a work-site health screening_____ you may discover factors putting you at risk for chronic disease.

A. and

B. ;

C. ,

Some claim that China will be the next big economic superpower others disagree with this statement.

A. but

B. ,

C. , yet