用括号内所给动词的适当形式填空。
—You have been chosen as the general manager of our company. Congratulations!
— Thank you very much. I never thought I____ (get) the position. I will work harder.
生物体进行生命活动所需的直接能源、主要能源和最终能源依次是 ( )
制约西北地区农业生产的主要因素是( )
下列关于实验现象的描述中,不正确的是( )