while
- You stand in line while waiting for the bus.
- While I was cleaning my room, my aunt ________.
- While I was walking along the lake, I saw some fish _____out of the water.
- While we _________, we saw a UFO land on a street.
- While Helen __________ the guitar, her mother came in.
- While she _______ , she cut herself.
- While heTV，a football flew into the room through the window．
- While I _ a Zhengjian Evening Paper inthe sitting room, the doorbell rang.[ ]
- He fell off the bike ________.
- While I _______ TV in the sitting room, the bell _______.