It is reported that the police _____________ (uncover) a plan to murder the president.
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We don’t know which company she was _________ (refer to) when she talked about competing firms at the meeting.
The police are trying to _________ (certain) exactly who were at the party last night when the fire took place.
If you want to become master of a language you have to study it in ________ (deep) for years.
Last week the plane crashed in the desert and the scientists are now ____________ (investigate) to find out the cause of the crash.