I'msorryIforgottowrite;Ihadsomuchelse________mymind.
A、over
B、for
C、on
D、about
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
A、Morethaneverbefore
B、Inthepast,therehavenever
C、Neverbeforehave
D、Formerly,thereneverwere
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
A、so
B、unless
C、if
D、while
It________asashocktorealizethatIwasnotaloneintheroom.
A、came
B、appeared
C、arrived
D、reached
WhenIcamethroughthecustomsattheairport,Ihadtopay________onaclockIhadbought.
A、taxes
B、duty
C、fines
D、fees