句型转换。

1. —Can I help you? (作否定回答)

    —_________________________.

2. —Would you like me to help you? (作肯定回答)

    —_________________________.

3. I have made a mistake. I found. (改为含宾语从句的复合句)

    I found that _________________________.

4. I don't think you will come back in time. (用didn't改写)

    I _____ think you _____ in time.

5. The moon circles the earth. (用told us改写)

    The teacher told us that _________________________.

FTP服务器利用______来控制用户对服务器的访问权限。