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Practice Reading: Fill in The Blanks (Drag & Drop) ID: #50556 Air Balloons
Instructions
* Drag the correct answer into all target fields
In  the  past  before  the  discovery  of  aeroplanes,  people  used  to  travel  using  hot  air  balloons.  Although  it  was  not  a  very  safe  option  in  the  beginning,  it  was  an    means  of  transport.  There  were  no  roads  or  quickest  means  of  travel  for  people  so  they  took  a  risk  of    in  the  air  using  this  heated  air  vessel.  Helium  and  hydrogen  were  used  later  on  as  an  improvement  to  the  earlier  design.  The  structure  was  very  aerodynamic  and  it  works  on  the  principle  of  displacement  of  air.  Many  kinds  of    were  used  in  the  beginning,  such  as  paper,  plastic  and  even  animal  skin.  The  discovery  of  hot  air  balloon  was    as  people  were  traditionally  used  to  flying  sky  lantern.  Nowadays,  the  technology  is  so  advanced  and  it  is  still  used  in  the    areas  where  there  are  no  roads  built  yet.

accidental remote manage earlier efficient matter materials traversing

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