Turn the sentence into the present perfect :
I have travelled the world.
James has met the president.
I have never been to space.
House prices have increased a lot.
Andrew do not grown since the last time I saw him.
This restaurant has become very popular.
Doctors have discovered cures for many diseases.
Man has been to the moon.
The computer has made it possible to learn online.
Sam has worked here for 7 years.
We have been in a relationship for 3 months.
They have been in the room all day.