The single invention of the computer _______many new professions.
| A．gave a birth to | B．gave birth to |
| C．gave births to | D．gave birth for |
He is very popular among his students as he always tries to make them ____
in his lectures.
| A．interested | B．interesting | C．interest | D．to interest |
With April 18’s railway speedup, highway and air transport will have to compete with ______ service for passengers.
| A．good | B．better | C．best | D．the best |
John was dismissed last week because of his ______ attitude towards his job.
| A．informal | B．casual | C．determined | D．earnest |
Since Tom ______ downloaded a virus into his computer, he can not open the file now.
| A．readily | B．horribly | C．accidentally | D．irregularly |
Alan is a careful driver, but he drives ______ of my friends.
| A．more carefully | B．the most carefully | C．less carefully | D．the least carefully |