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Scientists generally agree that Earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20,000 years since Ice Age.

I would appreciate it ________ you call back this afternoon for the doctor's appointment.

John shut everybody out of the kitchen ________ he could prepare his grand surprise for the party.

________ the police thought he was the most likely one，since they had no exact proof about it，they could not arrest him.

The medicine works more effectively ________ you drink some hot water after taking it.

________the American economy expanded at an annual rate of 2.5 percent in July—September, it faced a long road to recovery.

(2013·高考遼寧卷)One can always manage to do more things，no matter________full one’s schedule is in life.

(2013·高考山東卷)Mark needs to learn Chinese ________ his company is opening a branch in Beijing.

(2013·高考湖北卷)An artist who was recently traveling on a ferry to the southern island discovered________a long lost antique Greek vase.

—Did you return Fred's call?
—I didn't need to ________ I'll see him tomorrow.