He is a financial manager in Wall Street now, but nobody knows he ________ part-time jobs here and there for survival for eight years.
At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.
Only when I left home to go to college ___ how much my mother had done for me.
For many cities in the world, there is no room to spread out farther, _____New York is an example.
Beautifully ________ in a quiet spot near the river, the hotel attracts a lot of people to stay.
_________ we have been classmates for three years, she hasn’t left me much impression, so I can’t remember her after graduation.