1 . As far as I know, the robot that can sweep the floor ________ in the 1980s.

A．is invented

B．were invented

C．was invented

D．has invented

2 . By the time he left the college, he ______ dozens of things so he was a great guy.

A．has invented

B．was inventing

C．would invent

D．had invented

3 . 句型公式：sb/sth be said to do...“据说……”
据说亚历山大·格雷厄姆·贝尔在1876年发明了电话。
Alexander Graham Bell   _________the telephone in 1876.

4 . 虽然爱迪生实际上并没有发明灯泡，但他的确发明了电灯照明系统，这导致了灯泡的广泛使用。（although）
_____________, he did create an electric lighting system which led to its widespread use.

5 . 蒸汽机的发明给现代世界带来了巨大变化。（the-ing form做主语，steam engine）（汉译英）

6 . 人们一致认为查尔斯·巴贝奇发明了第一台电脑。
Charles Babbage is generally considered ________ ________ ________ the first computer.