Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
A、surround
B、substance
C、stretch
D、substitute
Pinetreesareusuallybelievedto_______coldweather.
A、guard
B、accomplish
C、roar
D、endure
Thisboywas_______forwhathehaddoneintheclass.
A、scolded
B、overcome
C、inclined
D、displayed
Thisriverformsanatural_______betweenChinaandKorea.
A、boundary
B、string
C、spot
D、zone
Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
A、continuous
B、difficult
C、convenient
D、sufficient