---- Did you visit the Big Ben in London?
---- No, we ______ it, but we spent too much time shopping.
| A．could visit | B．could have visited | C．must ahave visited it | D．can have visited |
It doesn’t matter ________ you pay by cash or credit card in this store.
| A．how | B．whether |
| C．what | D．why |
（2012全国新课程）It is by no means clear the president can do to end the strike.
| A．how | B．which |
| C．that | D．what |
（2012安徽卷）The limits of a person’s intelligence,generally speaking, are fixed at birth, but he reaches these limits will depend on his environment.
| A．where | B．whether | C． that | D． why |
（2012江苏卷）The notice came around two in the afternoon the meeting would be postponed.
| A．when | B．that | C．whether | D．how |
（2012浙江卷）I made a promise to myself______ this year, my first year in high school, would be different.
| A．whether | B．what | C．that | D．how |