The new education system is said to be _______ to the successful development of the country.
Leonardo da Vinci(1452-1519)__________ birds kept in cages in order to have the pleasure of setting them free.
The children talked so loudly at dinner table that I had to struggle __________.
—The last one __________ pays the meal. —Agreed!
—It’s a long time since I saw my sister. —__________ her this weekend?
When asked why he went there, he said he was sent there __________ for a space flight.