Mr.White ____________(代表)himself as an expert in protecting environment.
During the course of history，many____________(协议)have been made between France and England.
If global warming continues，more and more species of land plants and animals are becoming ____________(灭绝的)．
The legal speed ____________(有限的)within the city is 35 miles per hour.
Faced with these____________(吓人的)findings，we should take measures to protect our environment.