What's that noise?What (is happening)?

What's that noise?What (is happening)? ---what's that unpleasant noise? What's happening now tom is singing What's happening there what is happening ? happening what now is what is happening是什么意思? what is happening 歌词 what is happening 发生, What's that noise?怎么回答 what is happening?的happening是什么词性 what is happening on venus