单项选择题

Scarborough General Hospital has two （） for certified X-ray technicians to start immediately.

A.open
B.opener
C.openings
D.openness

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单项选择题

If the task is too complicated to figure out on （） own, please don’t hesitate to ask one of our representatives, who are here to help.

A.you
B.your
C.yours
D.yourself

单项选择题

（） something drastic happens before midnight, the postal workers will most likely walk out on their jobs.

A.Also
B.Except
C.Unless
D.Therefore

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