Over the past fifty years there (be) many changes in commerce. The products (deal) in and methods of production (progress) with new developments. Packing and shipping (alter) to make the transport of goods safer and faster. (Keep) records of transactions also (change) although many of the terms are still used as they (be) when the Italians (develop) accounting systems.
【参考答案】
have been; deal; have progressed; have altered; Keeping; hav......