检修工人在查看线路密集的电路板时，为了看清线路的连接情况，常透过一个较大的透镜进行观察，这个透镜应该是____ 透镜（填“凸”或“凹”），工人看到的是放大的____ （填“实”或“虚”）像；检修时还用到了照明灯，这是为了照亮____ __ （填“透镜”或“电路板”）．

单细胞生物虽然个体微小，一般用肉眼不容易观察到，但是能独立完成____、____、____等各种生命活动．

句型转换
____ She often does her homework at night. (变为否定句)
She                              her homework at night.
____ We are cleaning our classroom now. (对划线部分提问)
                  you          now?
____ He likes pandas because they are very cute. (对划线部分提问)
                he        pandas?
____ I think he is in the classroom.（改为否定句）
I        think he        in the classroom.
____ Mr Black is a doctor.（对划线部分提问）
                Mr Black         ?