21. Three hundered people were invited to the wedding by Mary and Tom.
22. I haven't seen her for 10 months.
24. We used to go camping together.
25. Two million books are sent to America every year.
26. Peter is not old enough to see the horror film.
27. What an intelligent girl.
28. She has a long black hair.
29. Alexander G.Bell was the inventor of the telephone.
30. Let's go to the movie tonight.
31. I used to live on a farm.
32. Nga is keen on listening to traditional stories.
33.Miss Jackson asked Tim to try his best to improve his pronunciation.
34. My father told me not to make so much noise.
35. They teach Maths well.
36. It's such a difficult word that we can't spell it.
37. It has been raining for an hour.
38. Many dangerous diseases can be cured by penicillin.
39. Is rice exported to Britain by your country?
40. She is looking forward to seeing her grandparents soon.