用所给单词的适当形式填空。每个单词限用一次。

speak    proud  empty  safe    term

There are three              in a year in the school in the USA.
My            English is a little poor. I want to improve it.
Confucius is a great thinker who is the             of all the Chinese.
When Chang’e Ⅰlanded ________ on the earth, all Chinese were cheerful.
The dustbins in the streets should be        every day.