It is fairly common in Africa for there______ a group of expert musicians surrounded by others who also join in the performances.

Do you know when ________? 

I would appreciate ________ much if you could write to me as soon as possible.

 He ______ prison two years ago and now he _______.　　

--- Daniel must have lost his job in that unemployment crisis, __________he? --- I don’t think so．Yesterday I saw him working together with his colleagues.