Bats are surprisingly long-lived creatures, some _____ a life span of around 20 years. 

With trees and grass_____ about 35％ of the urban area，the city of Hefei has taken on a new look.

Not far from the club, there was a girden, ____ owner seated in it playing bridge with his children every afternoon.

Walter offered us a lift when he was leaving the office, but our work _______, we refused his offer.

     the teacher           us, we can make great progress.