—Hi, why are you here?—I ________ for Susan for 15 minutes.A. have been waiting B. have waiting C. am waitingD am been waiting
What ______ amazing news!
—The lights in the classroom are still on. Do you know______. —To revise for the coming exams.
The students are too _____ to keep their eyes open in class because of staying up late.
The hotel is ________ for 400 people _________.
____ he was rich, he gave little money to the others.