—It’s a long time since we met last. Haven’t you graduated from college yet?—_____. I ______ English for four years in Nanjing University.
. In his opinion, man should try to make ________ most of the natural resources in ________Atlantic Ocean.
. The man to whom we handed the forms pointed out that they had not been ________ filled in.
. Playing with a cell phone, he suddenly ________ the teacher staring at him.
. She seemed ________ the book before, but she said she had never.
. ________ on the subject for half an hour, Liu Ying suddenly stopped.