________ it is to jump into a river in summer!
35.The highest award was given to Anna, who_________so hard on the project for years, and at last her efforts paid off.
34.Take the lift to the eighth floor and turn right. You_______have any trouble finding my office.
33.The highway through the rain forest was completed in 1990, _________some animal species have died off.
32.With so many trees and flowers_____about, our school campus looks like a beautiful garden.
31._________reasonable, the idea he to create a friendly environment attracted much public attention.