1. On ________ one hand, the development of modern industry has improved our living conditions, but on the other hand, it does ______ harm to our environment.

     A. the; the                 B. / ; the            C. / ; a                D. the; / 

2._________, failure is more meaningful than success to a person’s future.

A.In the way              B. By way of       C. Under way      D. In a way

3. They plan to go abroad for a holiday with the task _____ ahead of time.

A. to finish                B. finished        C. finishing         D. having finished