So far, several cases of a disease, ___________as H1N1, are reported to have been found in the country.
| A．knowing | B．to be known | C．having known | D．known |
The history of nursing __ the history of man.
| A．as old as | B．is old than | C．that is as old as | D．is as old as |
_____ born in Chicago, the author was famous for his stories about New York.
| A．Since | B．Once | C．When | D．Although |
_____ we stood at the top of the building, the people below were hardly visible.
| A．As | B．Although | C．Unless | D．In spite of |
Scarcely was George Washington in his teens _____ his father died.
| A．than | B．as | C．while | D．when |
_____ David goes, he is welcome.
| A．Whichever | B．However | C．Wherever | D．Whatever |