They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.
A. which; that B. it; one C. that; one D. one; that
They find themselves surrounded by colorful rocks, fishes, seashells and plants, all ____ slowly in the blue water.
A. waving and moving B. waved and moved
C. waved and moving D. waving and moved
Even though the pure water is ____ gives sea water its main properties, the salinity of sea water affects both its weight and freezing point.
A. the one B. which C. what D. that
Mike is Mrs.’ pet student, ____ all her students no one else is as nice as he.
A. because B. because of C. with D. as
He came running along and climbed ____ the train just as it was about to leave.
A. aboard B. board C. abroad D. on abroad
Just as one of the parents ____ it, students today are under far greater stress than ever.
A. says B. speaks C. puts D. gets
