（2012•河南）如图所示，在开口的矿泉水瓶上扎一个小孔，水便从小孔喷出．随着瓶内水面的降低，水喷出的距离越来越短，是因为小孔处水的压强逐渐变　 　．堵住瓶口，水很快就停止流出，此时瓶内水面上方的气压比瓶外大气压　 　．

句型转换。

1. Don't listen to the music in the classroom.(改为肯定句)

    _____ _____ the music in the classroom.

2. Can you please put your backpack on the desk?(改为祈使句)

   _____ your backpack on the desk, please.

3. We can get to the park at 8:00 a.m.(改为否定句)

    We _____ _____to the park at 8:00 a.m.

4. They have to be in bed by 10:00.(用he替换they)

    He _____ _____ be in be bed by 10:00.

5. His father is often late for work.(改为同义句)

    His father _____ _____ late for work.