You should book a train ticket_____ if you want to go home in time before the Spring Festival.
–Did you find your new dictionary? ---Yes. I found it ____I had left it.
–Will you ______me ____out this problem myself? ---OK.
–When did the concert_____? ---Oh, two days ago.
________arriving in Tibet , the soldiers at once joined them ____their work. At; with B. On; in C. For; with D. After; to
–Did Li Hua’s parents leave her any money? --- No. She has to support _______by selling newspapers.