Here are the sentences completed with the appropriate verb forms:
My car has just broken down.
We have been on this flight for 2 hours.
Weather satellites have been launched into space for many decades.
Your words have proved nothing.
The younger generation has not developed a habit of reading books.
I have been writing a diary since my young years. I have put down there all memorable events of my life.
I don't think Larry has satisfied his hunger. What else can we offer him?
Rick has been trying to achieve this aim for two years, but I don't see any result so far. I hope he'll be more successful this year.
We have considered all possible variants, but we have not chosen the best one.