______ is known to us all is that the old worker, ______ life was hard in the past, still works hard in his seventies.
Parents ____ bring up their children under 16 and educate them properly.
All of us found _____ necessary to learn a foreign language.
I used to _____ bed at nine. Now I am used to ____ bed at ten.
The life of Milu ____ at present.
_________ is known to all, he is good at English.