Language( )isthebiggestproblemforinternationalstudentsintheEnglish-speakingcountries.
A. proficiency
B. command
C. level
D. barrier
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Somebirds ( )towarmerplaceswhenwintercomes.
A. migrate
B. fly
C. immigrate
D. go
Thesepaintingsbywell-knownpaintersarebeing ( ) intheartgallery.
A. displayed
B. exhibited
C. shown
D. seen
Thehigh-techcompany ( )householdelectronicdevices.
A. produces
B. creates
C. invents
D. manufactures
Therearethree( )forthegeneralelectionthisyear.
A. politicians
B. candidates
C. people
D. presidents