The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
| A．witnessed | B．has witnessed |
| C．is witnessing | D．witnesses |
It sounds like a good idea, but it _________ to be seen whether it will succeed.
| A．leaves | B．remains | C．stays | D．reminds |
---Did you go to the show last night?
--- Yeah． Every boy and every girl in the area ____ invited．
| A．were | B．was | C．has been | D．have been |
you may have , you should gather your courage to face the challenge .
| A．However serious a problem |
| B．Whatever serious a problem |
| C．However a serious problem |
| D．No matter how a serious |
He was seriously injured．He lay on the ground, _______ to stand up．
| A．was unable | B．being not able |
| C．unable | D．being able not |
---Thanks for your help, but can you do me one more favor, please?
---____ , sir. What’s it then?
| A．Just a minute | B．At your service |
| C．That’s right | D．It’s my pleasure |