Choose the words or phrases that best fit ecach of the blank spaces

                         How to be a friend to the earth
There(41).........many simple things we can do to stop the(42)........of the environment.First of all, we should not dump our rubbish without(43).........which things, such as bottles and paper can(44).........
We should put objects that we can recycle in(45).......bins. Secondly, instead of taking our car whereever we go, we ought to leave it at home (46)........possible, and go on foot or(47).......public transport.When we have to drive to the supermarket (48).......our shopping , we should always remember(49).......our own bags(50).........we don't need to use the supermarket's plastic bags
41.A.are B.is C.was D.were
42.A.destroy B.destroyed C.destructive D.destruction
43.A.think B.to think C.thinking D.thought
44.A.be recycled B.recycle C.be recycling D.being recyled
45.A.recycle B.recycles C.recycled D.recycling
46.A.where B.whenever C.where D.wherever
47.A.on B.in C.by D.to
48.A,to do B.do C.to make D.making
49.taking B.to take C.take D.took
50.A.so B.that C.so that D.so as