Is _______ hard for you to finish the work on time?
-----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.
This CD-ROM can help you learn and have fun_____.