1.由that引导的宾语从句.2.由疑问词（what,when,how,why,where,whether,who）引导

1.由that引导的宾语从句.2.由疑问词（what,when,how,why,where,whether,who）引导的宾语从句.
1.she ask_____ her dress would be ready.
2.I don't understand______so many parents want their children to learn to play the piano.
3.Many people do not know _______the law on education was passed more than ten years ago.
4.They said______visitor should not smoke in the factory.
5.He told us _______he has heard about at the meeting.