Some，green．h0．u，se gases occur naturally in the atmosphere，while others______(由人类的活动造成)．

He was (terrible) _____ treated by his boss and so resigned.

Many unsuccessful people regret for their (lose) ___ youth.

She made it (know)______to all her classmates that she had bought a new pair of shoes.

Hardly had he finished his work______(电话就响了)．

To recognize business opportunity is vital for all business. Exploiting the opportunity requires decision-making. Management must decide what type of opportunity to pursue (追求). Decision is also needed when management recognizes a problem. Decision must be made regarding a clear definition of the problem: