Obama, _______ life was once hard when he was young, were elected President of American.
| A．for whom | B．who | C．to whom | D．/ |
______ him well, I would have invited him to my birthday party.
| A．Had I known | B．Should I know |
| C．If I know | D．If I knew |
---A man is not born in ____ of knowledge.
---True. We all gain our knowledge by keeping on learning in our life
| A．exhibition | B．possession | C．civilization | D．protection |
It was during World War II, ____ he was in his early twenties, _____ he joined the British Army.
| A．that; when | B．when; that | C．when; when | D．that; that |
_____ the fact that doctors have warned that smoking causes cancer, people still keep on smoking.
| A．Due to | B．Thanks to | C．Because of | D．In spite of |
_____ all my colleagues, I’d like to show all my sincere thanks to you for your devotion to our research.
| A．In case of | B．In memory of | C．In honor of | D．On behalf of |