there are a set of machines?

there are a set of machines? 是there is a set of keys还是there are a set of keys? 英语翻译7.a) how many dominoes are there in a double-six set of There are two ways to make these machines,but_ it worthy of There are all kinds of machines.They 1 in many different way 英语高考At our factory there are a few machines similar to _____ A set of keys ---(be) on the table.There ---(be) a set of ke Here is （）?Are these yours.A.a set of Machines are going to do Machines are going to do most of th there are a lot of Are there any machines in your home?(作出肯定回答) Those are a set of keys改为一般疑问句