We won’t know whether it will besuccessful. We won’t know whether there will be good _____.

下列各句中，没有语病的一句是

1In the street I met theprofessor______ gave us a talk last week.

Since you are in a public place, the noise of your radio must be ______ to a level that we all feel comfortable with.

The world economy has improved _____ since the end of last year, but major problems and challenges are not fully solved