—Sorry, sir. If my bike doesn’t         , I won’t be late for school again.
—What you say is hard to believe. This is the eighth time you have said so.
| A.work out | B.come across | C.put off | D.break down | 
.
 She can’t help ______ the house because she’s busy making a cake.
| A.to clean | B.cleaning | C.cleaned | D.being cleaned | 
.
 The country life he was used to _________ greatly since 1992.
| A.change | B.has changed | C.changing | D.have changed | 
.
 I’ve found that many people are still in _____ habit of writing silly things in _____ public places.
| A.the; the | B./; / | C.the; / | D./; the | 
.
 I think I had at least a billion test, __ one in which they cut out a piece of muscle from my leg.
  A. including B, include C. includes D. included
.
 He wanted to know what I thought, _____ confused me because I thought the author knew
  more than I did.
| A.when | B.that | C.which | D.where |