3.自从那时起，它变成了我生活的一部分。(since then)

 2.现在我拥有这辆自行车已经三年了。(for three years)

1.自从去年有了电脑，我就不怎么锻炼了。(since I got my computer)

6. China          (send) up several Shenzhou manned spacecraft into space since 2003.

5. He had to stay at home because of his      (ill) .

4. You should take more exercise,such as      (run) .

3. Mr Liu isn’t here now. He     (go) to Beijing.

2. Peter turned off the computer after he finished          (write) an e-mail.

1. —Is everyone here?

—No,sir. Jim        (not arrive) yet.  He is still on the way.

5. We have learnt 400 words      the begin ning of this term.