.Among all the problems,_______is so difficult as this one.
| A．not one | B．either | C．neither | D．none |
He was unhappy when he sold his guitar.After all,he _____it for a long time.
| A．has had | B．had had | C．has | D．had |
---What do you think of the house?
---_____.It is everything we have been looking for.
| A．Perfect | B．Good idea | C．Not bad | D．So-so |
A society cannot be successful if it throws tradition away, but it cannot be successful ____if we do something to stop progress.
| A．either | B．neither | C．too | D．also |
Not until he went through real hardshipthe love we have for our families is important.
| A． | had he realized | B． | did he realize | C． | he realized | D． | he had realized |
—Would you mind answering some questions on shopping habits?
— ________.
| A．Yes, with great pleasure | B．No, I am afraid I can't make it |
| C．Yes, it is worth the time | D．No, as long as it doesn't take long |