cheerful：adj  高兴的，快乐的

cheerfully：adv 愉快地，高兴地

cheer：v. 欢呼，喝彩，鼓舞，鼓励

cheer…up：（使）高兴起来，（使）振作起来。

例句：

All of us were cheerful after hearing the news.

He cheerfully went off to school. 他高高兴兴地去上学了。

When  I’m down or tired, I prefer movies that can cheer me up.

She was cheered by the news from home.  来自家里的消息使他收到了鼓舞。