8. —Must I clean the room now?—No, you _______. You can do it tomorrow.

23.—Steven, could you help me ______ when the plane will take off on the Internet?—I’m sorry, my computer doesn’t work.

47. By 1996, intelligence and education moved up to No. 5 on men’s ranking of desirable qualities in a mate.

20. If you _____ to the Shanghai Expo next month, I will go with you.

52. She asked me to dig some potato in the field with her. 

39.I am happy to win today’s match because my ______ was very strong and it was tough every time I played against her in the past.

30.—I hear that you took part in a forest clean-up activity last Sunday.—Yes, it ________ by our school green club to protect forests.

教师讲授的知识必须是科学的、确凿的、符合逻辑的，教师教授技能或行为要符合规范。上述体现了一堂好课应具备哪项基本要求?（ ）

10. Jane, please turn off the lights ______ you leave the classroom.

5. —Li Ping, I didn’t go summer camping last year.—_________.

13. I got a beautiful bike on ______ birthday. I like it very much.

11. —_______ have you been away from your hometown, Janet?—Since 5 years ago.