His health had_____ while he was in prison.

She prefers the sofa made of real leather although it costs more than that made of ______ leather. 

The records of S.H.E are____ being bought, for their songs can bring energy into us.

Twenty years have passed, I am glad to find the local people in some undeveloped areas are _________ than they were before.                                                                                  

For most informal dinners，you should wear comfortable，______  clothes.