Write the correct word.

1. Do you know who (invented / discovered) the planet Mars?

2. The number of people dying of malaria has (run / decreased) enormously over the last 100 years.

3. You need at least three people to (operate / estimate) this machine safely.

4. Modern (technology / equipment) makes all our lives easier.

5. We’ve done a lot of (research / experiment) into why people are scared of spiders.

6. I’m using a computer (research / program) that translates from English into Greek.

7. This drug seems to have no (effect / lack) on humans at all.

8. The experiment just (involves / operates) answering a few questions.

9. Could you (program / estimate) how many times a week you eat cheese?

10. Do you think anyone will ever (invent / discover) a time machine?

11. Professor Reinhart (decreases / runs) the computer lab with her three assistants.

12. There's (a lack / an effect) of phones in this office. We need some more!