14번>Thereare different ways attract(attract>to attract) business to areas where

unemployment is high. 에서 attract에 to가 왜붙나요?

2.P125  5번 Studies have shown that a positive environment can significantly improve worker

              (effectiveness/effecting)effectiveness답인데 ing는 안되는건가요???

6번 The project contributed to(raise/raising) environmental awareness.

     raising가 답인데요 동사의 목적어 자리 라서 ing쓰는건가요???

7번 Shoppers cannot help (to wonder/wondering) why the prices at the department store

     are so high. 저는 to wonder이 답인줄 알았는데 wondering가 답이더라구요 왜 ing로 쓰이나요?