下列实验基本操作正确的是（） A．蒸发食盐水 B．放入块状固体 C．稀释浓硫酸

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

小题1:There are three              in a year in the school in the USA.
小题2:My            English is a little poor. I want to improve it.
小题3:Confucius is a great thinker who is the             of all the Chinese.
小题4:When Chang’e Ⅰlanded ________ on the earth, all Chinese were cheerful.
小题5:The dustbins in the streets should be        every day.