Birds(can,can't)fly high,but they(can,can't)swim.怎么填

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Birds__(can,can''t)flyhigh,butthey__(can,can''t)swim.怎么填Birds__(can,can''t)flyhigh,butthey__(can,can''t)

Birds__(can,can't)fly high,but they__(can,can't)swim.怎么填
Birds__(can,can't)fly high,but they__(can,can't)swim.怎么填

Birds__(can,can't)fly high,but they__(can,can't)swim.怎么填
can；can't

1.can 2.can't

can,can't

Birds can fly high ,but they can't swim.
鸟儿能翱翔天际（飞的很高），但是它们不能潜游水底。