Youmustpayimport____oncertaingoodsbroughtintothiscountry.
A、money
B、fees
C、bills
D、duties
Theteachers’union_________alawsuitagainstthedistrictcallingforrepairing“deplorable”schoolconditions.
A、fired
B、filed
C、fined
D、filled
Ithink____importanttolearnEnglishwell.
A、this
B、that
C、it
D、youare
Everymeans____triedoutbutneverwithsuccess,asfarasmyknowledgegoes.
A、is
B、are
C、hasbeen
D、havebeen
GreatasNewtonwas,manyofhisideas____todayandarebeingmodifiedbytheworkofscientistsofourtime.
A、aretochallenge
B、maybechallenged
C、havebeenchallenged
D、arechallenging