The plan should be put into ________ at once.
A. exercise
B. doing
C. practice
D. retirement
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The destruction of ________ in this country is very serious.
A. nature
B. natural
C. naturally
D. naturalize
My hand came into ________ with something cold.
A. contrast
B. contact
C. communicate
D. compare
Her ________ is improving and will be released from hospital soon.
A. size
B. shape
C. statement
D. condition
The girl decided to go on a ________.
A. food
B. diet
C. nutrition
D. cook