You have be accurate in this job,because a small mistake can make a big___.答案是difference,但为什么trouble不行呢

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• You have be accurate in this job,because a small mistake can make a big___.答案是difference,但为什么trouble不行呢
• When you are in England,you must be very careful in the street because the traffic
• 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?