_____ environmental damage is done does it take many years for the ecosystem to recover.
They _______ when they heard him confess his fault.
The film is very interesting. _______students have seen it.
_______he is, he seldom shows his precious coins to others.
-----When will you leave for Paris for a visit? -----_______next month.
It’s impossible for all the people to get jobs because _______of them are not fit for them.