Obamaisthe ( )presidentoftheUS.
A. present
B. former
C. previous
D. past
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( ) dressissuitableforweddingceremony.
A. casual
B. beautiful
C. informal
D. formal
Language( )isthebiggestproblemforinternationalstudentsintheEnglish-speakingcountries.
A. proficiency
B. command
C. level
D. barrier
Somebirds ( )towarmerplaceswhenwintercomes.
A. migrate
B. fly
C. immigrate
D. go
Thesepaintingsbywell-knownpaintersarebeing ( ) intheartgallery.
A. displayed
B. exhibited
C. shown
D. seen