The world hash’t seen a pandemic（流行疾病）in 4 1 years，when the”Hong Kong”flu crossed the globe and kill...

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met, didn’t seen have met, hadn’t seen met, haven’t seen met, hadn’t seen

won’t be seen wasn't seen hasn't been seen hadn’t been seen

so exciting a film；/ such an exciting film；but so an exciting film；but such exciting a film；/

Never I have seen I haven't never seen Never have I seen I have seen never

to meet; hadn’t seen meeting; haven’t seen to meet; haven’t seen meeting; hadn’t seen

Never I have seen I haven't never seen Never have I seen I have seen never

haven’t seen; finished haven’t seen; finishing hadn’t seen; finishing hadn’t seen; finished

A.haven’t seen didn’t see don’t seen wasn’t seen

Yes, I have No, I haven’t Yes, I haven’t No, I have

Saw; haven’t seen have seen; didn’t see have seen; haven’t seen saw; didn’t see

I’m on the top of the worlD. Fancy meeting you here What brought you here How is the world treating you?

can’t mustn’t needn’t shouldn’t

where that which who

hash’t felt isn’t feeling doesn’t feel isn’t felt

that what how if

won’t be seen wasn’t seen hasn’t been seen hadn’t been seen

As long as I have seen much of the world Much as I have seen the world Now that I have seen much of the world As I have seen much of the world

弱碰撞自由的Hash函数强碰撞自由的Hash函数强Hash函数弱Hash函数

won’t be seen wasn't seen hasn't been seen hadn’t been seen