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

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。