Jawaban:

1. Have never had

2. Has graduated

3. Have worked

4. Have came up

5. Gone

6. Has spent

7. Has enabled

8. Has found

9. Has launched

10. Has proposed

Penjelasan:

1. I (never have) have never had a cell phone and I'm not going to get one.

2. Robert Noyce (graduate) has graduated in 1949 and then moved to MIT to earn his doctorate

3. When I was a Ph.D. student. I was a summer intem at a large aerospace company and I (work) have worked on camera systems.

4. Over the years, kids (come up) have came up with some pretty cool inventions.

5. Dr. NakaMats's 92th birthday has come and (go) gone

and he is still inventing.

6. Between 1873 and 1874, Bell (spend) has spent long days and nights trying to perfect the harmonic telegraph.

7. Brooke Martin, now 16. (enable) has enabled her invention with Wifi, so it can connect to the internet

8. By embedding protein into windows, Nikita Rafikov (find) has found a way to light homes without the use of electricity.

9. In 2012, a thirteen-year-old girl (launch) has launched

a potentially lucrative business built around her unusual cure for hiccups.

10. In 1685, Johann Zahn (propose) has proposed a design for the first handheld reflex camera. Ahead of his time, it would take another 150 years before his invention became a reality.

Semoga membantu :)