There’s a ________ in our office that when it’s somebody’s birthday,they bring in a cake for us all to share. (2011·山东,34)
They travelled around _____ Changchun by _____ bus.
John rushed out in a hurry, _____ the door _____ .
Please come to visit me if _________________.
---Why do you look so sad? ---There are so many problems_______.
Even the __________ doctor couldn’t cure him __________ his deadly disease.