1. I (read) the novel written by Jack London several times before.
2. Anna (do) an exercise on the present tense at the moment and she thinks
3. Tom (study) chemistry for three years.
4. The teacher informs that she (give) out class five tests this week.
5. What a beautiful old wooden chest! My grandfather (build) it over 60 years ago. 6. Mary dislikes (perform) the same tasks every day.
7. I think eating a lot of fruit (be) very good for your health.
8. Please be quiet! Their children (try) to complete the whole assignments.
9. You (receive) any letter from him since he left four months ago?