清晨，小鸟在树枝上欢快地啾啾叫。

In the morning, the little bird made happy ___chirps on the branch.

小鸟在树枝上欢快地啾啾叫。

The little bird ___chirped cheerfully on the branch.

小鸟在枝头欢快地叽叽喳喳。

The little bird ___chirped happily on the branch.