The humans are destroying nature day by day, ________ of course, will cause severe punishment from it sooner or later. 
#73318
A
who
B
when
C
on which
D
which
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If it _____ tomorrow, we won’t go to the park.
#41091
A
rained
B
rains
C
will rain
D
raining
 _______, her hands shook constantly and violently.
#70064
A
Knowing her son killed in the mine
B
When she knew her son was killed in the mine
C
Known her son killed in the mine
D
She knew her son killed in the mine