---Do you know when is _________ No Tabacco(烟草)Day?---It’s May 31st.
Don’t get off the bus __________ it stops.
James used _____ on the right in China, but he soon got used______ onthe left in England.
---Has he returned from Canada_________?--- Yes, he’s _________ come back.
--- Where have you _______? I didn’t see you a moment ago.--- I ________ to the library.
---________ do you use your computer ______ watching films?--- Nearly every day.