问几道英语题？急急急！！！

(1)The problem has nothing to do with other,you must s_____ it by yourself.

(2)As a student,your c______ is to learn all the subjects well at school.

(3)Li Ming is a ______(nine) grade student who wants to be a doctor.

(4)When we are unhappy ,we don't do ______(good) at school and we make our friends and family unhappy,too.

要详细解答哦！！！

(1)solve解决

(2)cause目标？（这个拿不太准）

(3)ninth（用序数词）

(4)well（do是动词，用副词well（好地）修饰）

(1)solve

(2)

(3)ninth

(4)well

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