A beautiful rainbow ________ the sky.
A. stood
B. through
C. across
D. spanned
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He felt ________ about his son’s safety.
A. anxious
B. serious
C. careless
D. careful
The boy is living in the ________ of the world.
A. night
B. darkness
C. dark
D. dampness
SI really ________ your helping me.
A. understand
B. appreciate
C. thank
D. want
The police arrested the ________.
A. mineral
B. crime
C. criminal
D. military