the topsoil of the earth is the subsoil, _____layer that contains stones mixed with a small amount of _____ organic matter

I can’t use your pen, ___ there is no ink in it

I was really surprised at the difficulty he had ______ English.[ ]

Dad,when will you be free You agreed to go to the seaside with me four days ago.—I’m sorry,Jack. But I think I will have a ______holiday soon.

I am going_____ you went last week.