1. Though a skilled worker, _____( 他被公司解雇了 ) last week because of the economic crisis.
2. He was disabled from birth, but he never felt frustrated, _____( 也从未屈服于任何困难 ).
3. The little boy next door has been beating his drum for a whole morning, which got on my nerves so much_____( 以至于我无法集中注意力学习 ).
4. The scientist tried to convince us that a tiger would not attack us_____( 除非它走途无路 ).
5. The nation ' s population continues to rise ______ ( 以每年 1200 万人的速度 )