My bicycle is nowhere to be found. Who ___ have been using it?
|
A．should |
B．must |
C．could |
D．might |
He cut off the electricity immediately he found the dangerous situation, thus ____ a fire accident.
|
A．prevented |
B．to prevent |
C．would prevent |
D．preventing |
But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.
|
A．as with |
B．as for |
C．as to |
D．as when |
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 |
