A. go out
Feedback come forward - to step in front.
go out - 1. to leave the house 2. to date with somebody 3. to stop working 4. to move abroad for earning money 5. to be old-fashioned.
keep up - 1. to continue 2. to go as fast as someone next to you 3. to succeed 4. to be up to date/to be aware of actual information on some subject.
fall behind - 1. to miss the deadline 2. to be left behind