根据音标拼写单词，使句子意思完整正确

1. He [spend]_________ too much time playing with them.

2. It’s my first time to  ________ [ju:z] the computer.

3. I usually go to bed at 9:00 but I can’t go to _______ [sli:p] at once

4. He is busy _______ organizing the activities

5. They are good _______

试说明频率调制光纤传感器的工作原理、应用。