代表representative; on behalf of
听力hearing; aural/listening comprehension
在exist; join or belong to an organization
当然certainly; natural: naturally
收发receive and dispatch letters or official documents; dispatcher
电视television; television images
练习practice; exercises for schoolwork
行go; something about travelling
课examine; learn or give a lecture
门door; something that opens and shuts
顺便in addition to what one is already doing, without much extra effort
预习prepare lessons before class