Hot ______ the night air was, we slept soundly after the long tiring journey.
| A．although | B．as | C．while | D．however |
_______twice, he didn't want to try again.
| A．Failed | B．Failing | C．Having failed | D．To fail |
______a nurse, she knew how to take care of a patient.
| A．Been | B．Being | C．To be | D．Be |
The______ look on his face suggested that he had passed the exam.
| A．exciting | B．tired | C．tiring | D．excited |
As a boy, he was_______ hard all day long.
| A．made to work | B．to make working | C．made working | D．to make work |
Many things _______ impossible in the past are common today.
| A．considering | B．to consider | C．considered | D．being considered |