The police were trying to _____ where the drug dealers were _____ it suddenly dawned upon them that they might be hidden somewhere 10 miles within the border between the two countries.
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A. come out; when B. make out; while C. figure out; when D. think out; since
It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ____ its captain and some passengers on board____ something supposed to be a UFO flying overhead.
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A. while; caught sight of B. when; caught sight of C. as; saw D. since; caught a sight of