Flying across the Atlantic for the first time was a great (achieve) ______ .

A．She was troubled by a difficult mathematics question.
B．She was worried about next Monday.
C．She was afraid to take part in an examination.
D．She was excited about the coming exam.

A．The tree was broken.
B．All the leaves fell down.
C．One of the branches fell down.
D．The tree was cut down.