He had been so absorbed____ watching the car passing by that he didn’t notice his friends ____.
I have no idea what _____ while I was asleep.
— What did you do during your holidays? — ______
Could you give me the phone number of _____ David Cooper on _____ Fifth Avenue?
Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.
If there were no automatic washing machines, people would have to wash their clothes ______ hand or ______ hand-operated machines.