We have been good friends __________ we joined the music club. A. before B. since C. until
________ you want to go out, let me know, please.
You ________ lend the bike to others because I’ll use it.
Linda is too excited to ________ at night because of the concert.
Don’t keep us ________ for a long time next time.
In China it’s impolite to speak _________ your mouth is full.