My cousin,along with his classmates,空happy with the school a

My cousin,along with his classmates,空happy with the school activities,
空they can improve their English a lot.
A is ,where.Bare,which.Cis that.Dare when

A
谓语与前面的主语单复数一致,along with是附属的,所以用is
后半句相当于in the school actviities----- they can improve their English a lot .用where 代替in the school actiivities这一地点状语,
where= in which（在哪里）----在活动中
which（指x 事物）而不能指在X事物中.
而且这里的意思当然是-----他们能在学校活动中大大提高英语,所以不用 which

谢谢了