So far, MERS(中东呼吸综合症) has become one of ____ illnesses in the world.A. seriousB. more seriousC. the most serious
Tom is ____________ boy now.
-----I bought this dictionary two weeks ago. ----You mean you __________ it for half a month.
The twins has studied in this school ________.
------When and where ____you _____the bag? ------ Oh, yesterday in my desk.
------Where is your father? ------He _______ Shanghai. He has ______ there for a week.