30. British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous situations________ others.
| A．more than | B．less than | C．other than | D．rather than |
22．________he is, he seldom shows his inventions to others.
| A．Inventor as | B．As an inventor |
| C．Being an inventor as | D．Inventor although |
21．This book is said to be a special one, which____many events not found on other history books.
| A．writes | B．covers | C．instructs | D．conveys |
15. Why didn’t you tell me there was no meeting today? I _______ all the way here through the heavy snow.
| A．needn’t have driven | B．can’t have driven | C．mustn’t have driven | D．shouldn’t have driven |
13. John received an invitation to dinner, and with his work _________, he gladly accepted it.
| A．finished | B．finishing | C．having finished | D．was finished |
7.---- Henry has been teaching English in Beijing University for many years.
---- It’s no _________ he can speak Chinese so well and idiomatically.
| A．matter | B．doubt | C．wonder | D．Problem |