Hopefully in 2030 we will no longer be e - mailing each other, for we （ ） more convenient electronic communication tools by then.
（A）have developed
（B）had developed
（C）will have developed
（D）developed
I was sent to the village last month to see how the development plan （ ） in the past two years.
（A）had been carried out
（B）would be carried out
（C）is being carried out
（D）has been carried out
In the 1950s in the USA, most families had just one phone at home, and wireless phones （ ） yet.
（A）haven't invented
（B）haven't been invented
（C）hadn't invented
（D）hadn't been invented
