阅读下面的短文，并根据短文后的要求回答问题。
It was Saturday again. Grace and Karen
disliked Saturdays. That was another thing the twins had in common. They shared
the same clothes and tied their hair in the same manner. In fact, it was hard
for their classmates and teachers to tell the difference between them
sometimes.
Unlike their classmates, they had to get up
early at seven every Saturday to prepare for their lessons. Grace had to attend
the art lesson and Karen had to attend her ballet lesson. "How I wish I
could do something different today," said the twins with one voice. All at
once, an idea came to Grace and Karen at the same time. "What about
exchanging our roles for a day?" they asked each other. It seemed like a
wonderful plan. After giving each other a description of their own friends,
Grace put on Karen's ballet dress while Karen put Grace's brushes and paints
into her bag. Then they left for their classes.
When the art lesson started, Karen was
lost. Unlike Grace, Karen was poor at drawing. When the art lesson finally
ended, Karen didn't dare to hand in her work.
Meanwhile, Grace had problems in the ballet
class as well. As she had no idea about the dance steps, she had to follow her
classmates blindly. As a result, she kept knocking into them. Their ballet
teacher became impatient with her, "Karen, you should remember the basic
steps."
When Karen and Grace got home, they were
tired out. They decided that they would never try to be someone else they were
not. It seemed that the grass was not
always greener on the other side.
根据短文内容回答下面的五个问题，每题答案不超过7个词。
