完成下列句子
1. He asked ______________________________ (谁的字写得最好).
2. He insisted ______________________________ (他与此事无关).
3. The girl has known ________________________ (怎样使用计算机).
4. Lei Feng _____________________________ (总是乐于助人).
5. You must ___________________________ (下课之前把作文交上).