_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To wait B. Having waited C. Have waited D. To have waited
_______ to sunlight for too much time will do harm to one’s skin.
A. Being exposed B. Exposed
C. Having exposed D. After being exposed
The bell _______ the end of the period rang, _______ our heated discussion.
A. indicated; interrupting B. indicating; interrupting
C. indicating; interrupted D. indicated; interrupted
The research is so designed that, once _______, nothing can be done to change it.
A. begins B. having begun C. begun D. Beginning
In Dali Mr Green was so struck by the beauty of _____nature that he stayed for _____third week.
A.the ; the B. the ; a C. 不填；the D. 不填；a
—Try not to work yourself too hard. Take it easy.
—Thanks. ________.
A. So what? B. No way C. What for D. You too
