Many teens don’t get enough sleep because they have too much homework, which ____ them up at night.
| A．makes | B．breaks | C．turns | D．keeps |
_____ will conquer nature.
| A．The man | B．Man | C．A man | D．The men |
I earn 10 dollars _____ hour as _____ supermarket cashier on Sundays.
| A．a, an | B．the, a | C．an, a | D．an, the |
As a result of destroying the forests, a large _____ of desert _____ covered the land.
| A．number, has | B．quantity, has | C．number, have | D．quantity, have |
David helps his mother with her housework every Saturday for about _____.
| A．one and half hours | B．a half and an hour |
| C．an hour and half | D．one and a half hours |
Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |