Ken is my friend. He ____ (come) from London, UK. Five years ago I ____(meet) him at Lily's party. Then we ____ (become) good friends. Ken and I ____ (reach) Washington D.C. at the same time. We____ (start) to study medicine in the same school. Now we are still studying together. So I know more about him. Ken is funny He often ____ (make) up some interesting stories to make me laugh. He says he's not going to be a doctor when he graduates (毕业). He ____ (want) to be an actor. He ____ (take) acting lessons when he is free. He ____ (make) lots of funny movies to make people happy. I believe his dream ____ (come) true.

修改句子。

但从所有太阳系的行星中，火星的环境是与地球最相像的。火星的直径大约是地球的一半，那里还有相当于地球上三分之一的重力和百分之一的大气浓度。

停止蹬车后，行驶在水平路面上的自行车仍继续向前运动一段距离，这是因为自行车具有 ____，自行车最后还会停下来，这是因为它受到 ____的缘故．

选出划线的词语解释有误的一项（    ）