as a middle school student,i should focus more ___my studies

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as a middle school student,i should focus more ___my studies
in
on
with
at
要原因那!
many of the teenagers in big cities____from ___
suffering,suffer,suffered和 stress,stressed,stresses
选填.要原因原因原因!1111

1 填 on
focus on 集中（精力/意志/精神等）于,专注于
作为一名中学生,我应该更加专注我的学习.
2 选 suffer stress
第一个填动词原形,因为是复数,第二个填名词,压力的名词不可数
很多大城市的青少年都承受着压力
再问： from后面可以加形容词吗？？？？？？？？？？？？？？？？
再答：一般没有吧， from 是介词，后面一般跟名词比如 I am from class one

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