Every possible means ________ to prevent the air pollution, but the sky is still not clear. [ ]

Unfortunately, when I dropped in, Mr. Smith __________. So we only had time for a few words.

You don’t have to worry about the journeybecause I have made a ______ on the Indian Pacific train to Perth.

21 More than one high official_____by the police since the mayor warshot dead

Who is the man over there Is it Mr. Li—No, it _be him. Mr. Li is much taller.