The workers and technicians worked hard _____ to get the Great Hall finished before National Day. 

—Your sister’s plan is not quite practical.Why not try to persuade her to give it up?—My sister is very stubborn，so it is________to try to change her mind.

The quality of the teachers will influence the students,and ________, the quality of the students will influence the teachers.

The country has been ______ war with its neighbor for almost ten years.

 I’m glad to learn that his attitude _____ this plan is similar _____ mine.