根据汉语意思完成句子

1. 今天早上她被烟雾警报吵醒了.

    She was woken this morning by a                 .

2. 雨林正以惊人的速度消失.

    The rainforests are disappearing at an        rate.

3. 我把闹钟定在7点.

    I set                                 _____7 o'clock.

4. 他惊慌地跳了起来.

    He jumped up                   .

5. 听到那声音,她决定发出警报.

    She decided to                        _____when she heard the noise.