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用动词不定式或
It is fine day today, so I suggest ________(go)for a walk．
The old couple used ________（在河边散步）after supper.
I learnt ________(swim)when I was three years old．
Where is Lily? I need ________(talk)with her．
It's our duty ________（保护环境）so that people can live a better life.