Do you know the girl _________ is singing in the classroom?A. when B. who C. which
He hasn’t got a letter from his uncle .
It is _____ unlucky day today. I’ve lost _____ useful pen.
Can you help me? I have trouble _____ the story in English.
--- Grandpa, this morning you were watching _____ alarm again. Why? --- Because it has _____ meaning to me, my dear grandson.
---Drinking too much cola is bad for our health. --- Yes, I _____ you.