As is well known, it is Hawking who the theory of black holes.A, puts forward B, has put forward C, invented D, raised
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.
I was just about to go out last night ______ the telephone rang.