Do you know the girl _________ is singing in the classroom?A. when B. who C. which
I don’t think skiing is__________skating.
Everyone knows Wuxi is larger than _________ in Shandong.
He has some problems _________ his English learning.
Would you please ________ the children ________ with snake?
--Did you do _____ in the countryside with your family? --Yes, I helped my grandma feed chickens and sheep.