________ more careful, his ship would not have sunk. 

—Oh my god! You__ wear slippers to attend the conference． —I'm sorry I forgot there is a conference．

According to the school rules, no student _____go out of the school after eleven o’clock at night without the teacher’s permission.

He desired that he ______ the right to vote.

---I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.--- Oh, it ____ my uncle. He was in my room then.