-Do you know the boy________ is sitting next to Peter?-Yes. He is Peter's friend. They are celebrating his ________ birthday.
—Do you mind if I put my baggage here for a while?
—What do you mean?—I'm saying that we need to be careful about ______
Jack is someone ______ you will miss a lot after you leave school.
—Do you remember ______ he came?—Yes, I do. He came by car.
We had Jay lead the way through the forest because " an old horse knows the way". Jay is ______