11. Lan and Mai (be) . . . . . . . . . . students.
12. Nga (wait) . . . . . . . . . . . . . . . . . . for a bus at present.
13. (Be) . . . . . . . . . . there any trees around your house?
14. Mr. Lam (travel) . . . . . . . . . . . . to HaNoi by plane.
15. . . . . . . . . . they (have) . . . . . . . . . . lunch at a foodstall now?
16. Look ! The teacher (come) . . . . . . . . . . . . . . . . .
17. . . . . . . . your father (get) . . . . . . . . . .up at five every morning?
18. What . . . . . . . . you (do) . . . . . . . . . . . . .? I am listening to music.
19. Thu (go). . . . . . . to school by bike every afternoon.
20. Where . . . . . . . . your sister (go) . . . . . . . at the moment? She(go) . . . . . . . . . . . to her office