Both sugar and salt can ______in water.
A、desert
B、absorb
C、dissolve
D、involve
Thisriverformsanatural_______betweenChinaandKorea.
A、boundary
B、string
C、spot
D、zone
Pinetreesareusuallybelievedto_______coldweather.
A、guard
B、accomplish
C、roar
D、endure
Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
A、continuous
B、difficult
C、convenient
D、sufficient
Freemedicalserviceis_______tonearlyallthecollegestudentsinChina.
A、favorite
B、available
C、convenient
D、average