20. His parents were teachers in that school, _______ lost their lives in order to save their students in the earthquake.
Nothing could be done, he_____ absent.
He ________ the exam, but he was too careless.
These chairs may look good, but they’re very un-comfortable _____.
Do you prefer_____when your boss takes an interest in your personal life?
When the clock ________ 11, I was about to leave for the supermarket.