How did you get on? Here are the answers!

Ciamar a chaidh dhut? Seo dhut na freagairtean!

Bha na seinneadairean gan clàradh aig a' chuirm-chiùil.
The singers were being recorded at the concert.
Am bi am prògram ga chraoladh a-nochd?
Will the programme be being broadcast tonight?
Cha bhi an t-òran sin ga chluiche air an rèidio a-nochd.
That song won't be being played on the radio tonight.
Tha na prògraman gan dèanamh anns an stiùidio.
The programmes are being made in the studio.

Remember there [are other structures]is a very similar structure which use ga with an active meaning, where the pronoun or noun is actively doing the action described by the verb: 

Tha mi ga dh èanamh an-dràsta.  I am doing it just now. 
Bidh iad gan c làradh a-màireach.  They will be recording them tomorrow. 
Bha Iain ga d èanamh an-dè.  Iain was doing it [feminine] yesterday. 
Bha Iain ga dh èanamh an-dè.  Iain was doing it [masculine] yesterday. 
Bidh na balaich gan c umail.  The boys will be keeping them.