Obama is ____________ the first black president of the USA. A. known as B. known of C. known for D. known to
After a week,he_______ good ideas to solve the problems.
The problem is so ______________ that I can solve it ________________.
Betty arrives _______ London _______ the morning of June 1st.
_____bedroom is very big.
Most people _______when the big earthquake took place in that area.