Fill in each numbered blank with one suitable word. In the early days of photography, a tand or some other film support for the camera was essential. This was because photographic materials were (1)...... insensitive to light that a typical exposure lasted several seconds. The camera (2)...... have to be held still for this time in order to obtain a sharp picture. The subjects also had to be still if their images (3)....... to register properly on the film. some early street scenes include blurred, transparent, ghostlike images of people (4).... wandered past while the scene was in the process of (5)....... photographed. Studio portraits from the late 1800s show people posed rigidly, often leaning against furniture, (6)..... helped them to remain motionless. (7)....... it was important to keep the head still, a support was often provided (8)..... the neck. Bright studio lights, sometimes produced by (9)...... fire to a strip of magnesium or a small pile of magnesium powder, helped (10)...... reducing the required exposure time. Giúp mình gấp với ạ