Translation of "Merrily" in Chinese

Little birds are singing merrily.

小鸟欢快地歌唱。

He drove his car, whistling merrily.

他一邊駕著車，一邊快樂地吹著口哨。

Jim drove his car, whistling merrily.

吉姆一邊駕著車，一邊愉快地吹著口哨。