Ответ:
exercise 1
a) I have been to three countries in my life.
b) My parents have travelled around the world.
c) My best friend has never eaten pizza with chocolate.
d) I have never met the Queen.
exercise 2
a) I have ridden a horse and a camel.
b) I have never made a snowman.
c) My parents have never tried sushi.
d) My sister has gone to a concert.
e) Has your brother ever seen a ghost?