IX. 

40. Although the weather was bad, they ha a wonderful holiday

41. A new mall will be built here

42. Mai spent 5 hours going to the seaside last week

43. They have lived in this village for 20 years 

44. Lam was too surprised to say a word

IX. 

45. I haven't met Mai since last Monday

46. If it doesn't rain tomorrow, i will go camping with my friends

47. We used to wear uniforms when we were at school

X.

48. His parents were happy because he got a job

49. Tuan has taken part in different charity activities

50. You must get a letter from a doctor that shows you are in perfect health

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4. Their work will be finished tomorrow

5. Mary asked Minh why he learnt English

IX.

1. Energy from the sun is cheap and clean

2. Mark Twain was one of the most famous writers in America

3. I have lost the novel that you gave me on my birthday

4. I am writing to complain about the shoes i bought at your shop last week

5. Many children spend lots of time surfing the internet every day

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