A. So
B. While
C. Unless
D. Even though
A. while
B. if
C. because
D. or
A. If
B. Unless
C. While
D. After
A. what
B. which
C. that
D. where
A. that
B. while
C. after
D. so
A. although
B. before
C. if
D. yet
A. that
B. and
C. so
D. while
A. because
B. before
C. unless
D. even though
A. whatever
B. whoever
C. whenever
D. whichever
A. whereas
B. when
C. whenever
D. so
A. leak
B. release
C. poison
D. pollutant
A. natural
B. plastic
C. synthetic
D. artificial
A. decreasing
B. reduced
C. smaller
D. compressing
A. accident
B. fullness
C. mass
D. crowd
A. imprisonment
B. lock
C. detention
D. freedom
A. imprisonment
B. lock
C. detention
D. freedom
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