Wouldn’t it be ______ wonderful world if all nations lived in ______ peace with one another?
.---There is a lot of smoke coming out of the teaching building. ---Really? It _____be a fire, most probably.
–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