单项选择题

The period ______dance classes increases gradually from two or three hours a day to five or six.

A. referred to
B. kept to
C. attached to
D. given to
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We ______the help he gave us when we moved to our new house.
A. thanked
B. appreciated
C. obliged
D. owed
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He will probably be awarded a Nobel Prize on account of his ______ achievements in chemistry.
A. high
B. worthwhile
C. outstanding
D. powerful
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