I used to drink a lot of coffee, but these days I _____ tea.
| A．prefer | B．am preferring |
| C．have preferred | D．preferred |
She is in a poor______of health, which worries her mother much.
| A．position | B．situation | C．state | D．condition |
The experiment turned out to be ________, which wasn’t ______ they wanted.
| A．a completely failing; as | B．a complete failure; what |
| C．completely failure; that | D．failed; 不填 |
In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
| A．species | B．group | C．amount | D．variety |
He was chosen _________ of the company.
| A．manager | B．a manager | C．the manager | D．as a manager |
I looked under __________ bed and found __________ book I lost last week.
| A．the; a | B．the: the | C．不填; the | D．the; 不填 |