A. used
B. arrived
C. closed
D. liked
A. internet
B. invent
C. bucket
D. spend
A. watch
B. chemistry
C. latch
D. check
A. teach
B. jeans
C. clean
D. instead
A. rice
B. pipe
C. fill
D. appliance
A. on the walls
B. on the ground
C. on the roofs
D. on the tree
A. a day
B. a week
C. a number of weeks
D. a number of days
A. by the year 2014
B. by the year 2015
C. by the year 2016
D. by the year 2017
A. oil
B. smoke
C. cars
D. pollution
A. because much pollution is caused by coaches
B. because much pollution is caused by cars
C. because much pollution is caused by animals
D. because much pollution is caused by things that benefit people
A. trains
B. cars
C. bus
D. automobile
A. turn
B. to turn
C. turning
D. turned
A. after
B. for
C. up
D. at
A. but
B. since
C. however
D. so
A. aren't you
B. you aren't
C. do you
D. don't you
A. happy
B. happiness
C. happily
D. unhappy
A. Therefore
B. Because
C. Although
D. However
A. which
B. when
C. who
D. where
A. beauty
B. beautiful
C. beautifully
D. beautify
A. pollute
B. polluted
C. pollution
D. pollutants
A. to use
B. used
C. using
D. should use
A. inventions
B. invent
C. inventor
D. inventing
A. go
B. to go
C. will go
D. goes
A. to save
B. saving
C. saved
D. save
A. turn on
B. turn off
C. turn in
D. turn down
A. on
B. in
C. with
D. to
A. work
B. has worked
C. worked
D. have worked
A. built
B. was built
C. are built
D. is built
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