If we ___ hard in the past few years, things wouldn't be going so smoothly.
A.hadn't been working
B.were not working
C.didn't work
D.wouldn't work
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Starting with the ___ that there is life on the planet Mars, the scientist went on to develop his argument.
A.premise
B.pretext
C.foundation
D.presentation
After several nuclear disasters, a ___ has raged over the safety of nuclear energy.
A.quarrel
B.suspicion
C.verdict
D.controversy
Their diplomatic principles completely laid bare their ___ for world conquest.
A.admiration
B.ambition
C.administration
D.orientation
Hot metal ___ as it grows cooler.
A.contracts
B.reduces
C.condenses
D.compresses