He _____ more than 5,000 English words when he entered the university at the age of 15.
| A．has learned | B．would have learned |
| C．learned | D．had learned |
Half an hour has been made full ______ of _____ the problem.
| A．using; studying | B．use; to study |
| C．to use; to study | D．use; studying |
—How did the fire_____?
--By a car accident.
| A．come about | B．come on | C．come to | D．come over |
In China, smokers have to face the reality that ______ people are dying of lung cancer.
| A．a great number of | B．a great deal of |
| C．a good many of | D．the number of |
Please tell me ______ you are getting on with your new classmates.
| A．whether | B．how | C．what | D．where |
Although we often send emails to each other, we have never seen each other ______.
| A．in my eyes | B．eye to eye | C．in my face | D．face to face |