9. Let us ______ (wait) outside.

8. _______ (travel) by air is very fast.

7. He _____(read) a book when the accident　　 (happen).

6. Joan’s mother often _______ at four, now she 　　　(cook).

5. We ________________　 (see) Uncle Li tomorrow.

4. He　 ______ _______(not　 have) his supper yet.

3. Do you like ________ (drink) milk?

2. -What _____ you ______(do)?

　　 -I _____ (be) a teacher.

1. He______ (go) to America the year before last.

10. 不同的学习方法