_did he come?—He came to ask for help.
____ your sister know Tom? —No, she ____.
The best tickets for LiYundi’s concert on May Day ____________ more than 2,000 RMB
When did you buy this computer? It looks so new.— I it for only a couple of days. My sister bought it for me as a birthday present.
A new laptop costs about _____ of a second-hand one.