_________ is known to all, he is good at English.
__________knowledge comes from practice is known to all.
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
______ surprised the hostess most is _______ one of her friends left the party without saying a word.
The arrival of the European settlers had a great on the life of the Native Americans.
I prefer studying English at home ______the match