二单项填空（15分）
21.Two rich men made ___bet on __result of the horse race.
A. the;a B.a;a C.a;the D.the;the
22---Do you know Amy’s address?
---____. As a matter of fact,I don’t know any Amy.
A.I don’t understand B.I’d rather not
C.I hope not D.I’m afraid not
23.You ought to take a break __you’ve finished your work.
A.now that B.as though C.even if D.so that
24.____we will go to the zoo or not depends on the weather.
A.Why B.How C.Whether D.That
25.Only when John returned home_____that someone had broken into his house.
A.he did realise B.did he realise
C.he realised D.he had realised
