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

单项选择题I got up early but I () so, because I had no work to do that morning.

A. didn't need to do
B. didn't have to do
C. needn't have done
D. hadn't got to do

单项选择题Don't leave your car under No Parking sign () your car may be towed away by the police.

A. or else
B. because
C. if not
D. or rather