A young man was killed in his apartment yesterday and the police are now trying to _________ (certain) what really happened.
查看答案
It is reported that the police _____________ (uncover) a plan to murder the president.
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.