-Do you know the boy________ is sitting next to Peter?-Yes. He is Peter's friend. They are celebrating his ________ birthday.
________ of experience made John fail in the interview,but it didn't mean that he couldn't find a suitable job.
Helen always helps her mother even though going to school ________ most of her day.
There are many wonderful theme parks in America, ________ Disneyland in California is my favorite.
The telephone system has ______. How can I contact him?
The wheat fields are irrigated by water _____ from a pond through bamboo pipes.