(1)As you can see,  many trees are being cut(cut) down by humans now.  

(2)Look,  the river is being polluted(pollute) by the waste from the factory.  

(3)Lots of trees are being planted(plant) by students over there.  

(4)Is the bridge being repaired(repair) now?  

(5)She is outstanding in school and always being praised(praise) by the teachers.  

(6)He said that the silly questions were always being asked(ask) by the boy.  

(7)A modern school is being built(build) in our city.  

(8)Please keep quiet!  The students are being taught(teach) how to pronounce the words.  

(9)Would you please keep silent?  The weather report is being broadcast(broadcast) and I want to listen.  

(10)Many new houses are being built(build) at present in the disaster area.