______ is known to all is that the old scientist, for ______ life was hard in the past, still works very hard in his eighties.
The young man, __________ abroad for two years, decided to go back to his motherland.
Tom returned from the manager's office, __________ me that the boss wanted to fire me.
__________ the task, they had to stay in the lab for another two hours.
The storm left, __________ a lot of damage to the city.
With weather __________ fine, we see more and more birds around us.