The reason for their unusual behavior remains a puzzle.()

单项选择题Norman Blamey is an artist of deep convictions().

A.statements
B. beliefs
C. suggestions
D. claims

单项选择题The park gave the whale to the Foundation and big contributions came from all parts of the world.()

A. dominations
B. denotation
C. donations
D. signatures

单项选择题I had some difficulty in carrying out the plan().

A.making
B. keeping
C. changing
D. implementing