一、1、Arabic
2、Germany
3、French
4、mixture
二、1、by
2、In
3、in
4、with
5、on;in
三、1 - 6 B C A B A C
四、1、Have they ever traveled by plane?
2、Tony has never been to the Great Wall.
3、I entered the singing competition last year.
4、I have ever cooked dinner for my parents.
5、In the end they reached the top of the mountain.