1. He said that the Earth had been formed approximately 4.54 billion years ago and was the only known planet that can support life

2.Mary wanted to know whether John would be using the computer the following day or not.

3. Jenny said that she preferred typing email to write snail mail because it was more convenient for her.

4. We may have to analyze further more essential roles of science technology to improve human's life at the last part of our assignments

5. Our teacher often reminds us to use netiquette appropriately whenever we write emails.

1. He said that the Earth had been formed approximately 4.54 billion years ago and was the only known planet that can support life.

2. Mary wanted to know whether John would be using the computer the following day or not.

3. Jenny said (that) she preferred typing email to writing snail mail because it was more convenient for her.

4. We may have to analyze further more essential roles of science technology to improve human's life at the last part of out assignments.

5. Our teacher often reminds us to use netiquette appropriately whenever we write email.