While he was investigating ways to improve the telescope, Newton made ______ discovery which completely changed ______ man’s understanding of colour.
It’s possible that Paul was linked to the attempted murder; he _____ have had a hand in planning it.
The old man has retired from the factory. He _____ there for 30 years.
Generally, _____ to a university in western countries, international students need to prove their ability to speak English.
Try to eat food groups _ _ vitamins A, C and E—they will do lots of good to your eyesight.
The discovery of new evidence led to ______.