根据下列短文,写出与各小题所给汉语相对应的英语单词的正确形式。（每空一词）
Dear Auntie Amy,

Great news! Mrs. Mumford just told me I had been chosen as one of the school students to visit the University of Cape Town in South 【小题1】 (非洲) this summer! She said the program was designed for 【小题2】(成百）of the teenagers to experience a different culture. What a good chance.

The only problem is: mom and dad simply won't let me go. They said it was too dangerous for a girl to 【小题3】（旅行）alone. But my guess is that they think it too 【小题4】 (昂贵的). I keep telling them I had been on a plane on my own before. This trip would be 【小题5】 (差不多) the same as that time when I had visited you in Texas. But they just won't listen!

Will you help, Auntie Em? I really want to go because it will be very important experience to my personal growth.

Love, (and love you even more ) if you manage to make mom and dad agree with me.