While watching tv,_____A.we heard the doorbell ringing B.we heard the doorbell rang我选的是A,是错误的.为什么错?答案B为什么是对的?

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• While watching tv,_____A.we heard the doorbell ringing B.we heard the doorbell rang我选的是A,是错误的.为什么错?答案B为什么是对的?
• while walking in the street ,you have to be very careful toavoid__down by passing cars or trucks.a.to be knocked b.being knocked 答案为什么不是a?不应该是将来吗?虽然avoid+doing,可是前面还有while while 的主句不是要+done吗?在什么时候while +done：doing+when?都表示什么?就像这道题while watching tv,___ a.the doorbell rang b.we heard the doorbell ring c.we heard the doorbell rings d.we heard the doorbell rang 如果是B.C.D怎么分析?为什么?
• latter是什么意思?the former……the latter……是什么意思?谢谢了!
• While I was waiting to enter university,I saw in a newspaper a teaching job [16]___ at a school about ten miles from where I lived.Being very short of [17]___ and wanting to do something [18]___ I applied（申请）,[19]___ as I did so,that without a degree and with no [20]___ of teaching,my chances of getting the job were [21]___.However,three days later,a letter arrived,calling me to Croydon for a meeting with the headmaster.It proved to be a [22]___ journ