26. Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
| A．of; to | B．for; to | C．on; on | D．in; on |
While dancing happily at home,_______________ ．
| A．the door bell rang | B．the door bell rings |
| C．we heard the door bell rings | D．we heard the door bell ring |
Some people argue using ____________ nature to meet our own needs may spell disaster, unless we start to look around and understand how _________ clean environment benefits us all.
| A．/; a | B．the; the | C．the; a | D．a; a |
－Do you mind if I keep pets in this building ? －_____________________.
| A．Of course not. It’s not allowed here | B． I’d rather you didn’t, actually. |
| C．Great! I love pets | D．No, you can’t. |
---Excuse me, Sir, is the swimming pool open every day?
---______, only from 6:00 pm to 10:00 pm
| A．That’s right | B．Yes, of course | C．Sorry, I’m not sure | D．Sorry, I’m afraid not |
_____ interested her most was the longitude line. It’s an imaginary line ______ the eastern and western halves of the world.
| A．That; dividing | B．What; divided | C．That; divided | D．What; dividing |