Iusuallywalktoschool,but____buswhenitrains.
A、inDoyouknow________?
MrHuang____toKunming.He’llcomebackintwoweeks.
I'llarriveat10:00a.m.tomorrow.Willyoupleasemeetmeattheairport?
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Throughout_______history,Englishlanguagehasgonethroughmanychanges.
Iusuallywalktoschool,but____buswhenitrains.