实验发现：

下列有关绿色植物特征的叙述，错误的是（ ）

春秋战国是社会大动荡的时期，政治上，春秋时期出现____局面，战国时期形成“战国七雄”的局面；学术思想领域出现了____的繁荣景象。

根据句意及首字母提示补全单词或词组。

①He wants to ____ (训练)his worker for the work.

②I am not sure.____ (也许)you are right.

③.Smoking is bad for our ____(健康).

④Many of us have ____ (听说)the film Walking with Dinosaurs (《与恐龙同行》) ,but no one has seen it.

⑤His parents want him to____ (退学)and help them work on the farm.