ou go outing with your sisters, you must see to ________ that they are safe.

Suddenly it____to me that we could use a computer todo the job.[ ]

__________ any other species, human populations are shaped by the usual forces of natural selection, like famine, disease or climate.[ ]

Zhang, what’s wrong with your eyes? Youhave dark eyes.— Oh, I toolate last night. I slept for only two hours.

acts, scientists have_______ thatmore energy is being absorbed from the sun, throwing the earth’s energy “out ofbalance”