The chairman threatened ________ if his policies were not adopted.
A to resign
B resigning
C to be resigned
D being resigned
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She was able to give the police a full account of since she had been ________ to it.
A an observer
B an on-looker
C a watcher
D a witness
Very few people understood his lecture, the subject of which was very ________.
A obscure
B upsetting
C distant
D inferior
Although the national government has introduced some new laws on this subject, it is the ________ state governments which are responsible for pollution control.
A precisely
B primarily
C progressively
D preliminarily
He would ________ it that his son took a livelier interest in politics.
A see into
B see through
C see about
D see to