把下列句子改为间接引语

1. "What are you doing,Tom?"

    I asked Tom what                            .

2. "Do you often come to school by bus?"

    My classmate wanted to know if                     .

3. "Why can you finish it so soon,children?"

    Mom asked the children why                       .

4. "Li Xin is better at English than math," said the teacher.

    The teacher said that                            .

5. "My father has been to Hong Kong twice. " he said.

    He said that                              .

对《植物检疫条例》规定必须检疫的植物和植物产品，以下说法中哪个是错误的？（）

A、经检疫未发现植物检疫对象的，发给植物检疫证书

B、发现有植物检疫对象的，经彻底消毒处理合格后，发给植物检疫证书

C、发现有植物检疫对象的，且无法消毒处理的，应停止调运

D、发现有植物检疫对象的，必须立即销毁