Помогите пожалуйста с заданием по грамматике
 

Replace clauses in bold type by participle constructions where possible:1. The children who are singing and dancing on the stage are from the neighbouring community.2. The poster which attracted my attention advertised road-building machinery.3. We got in touch with the firm which producers computers.4. We received the cable which informed us of the arrival of the goods at our port.5. The firm sent us material which describes the manufacturing programme of Brown & Co.