Sure, let's go through the questions one by one:

**26. Linda: "Would you like to go out for a drink with me?" Anna: "Yes,**
- A. thanks
- B. I'd love to
- C. What?
- D. Not at all

**Answer: B. I'd love to**

**27. The Internet is very useful. Online, you can pay your bills, buy clothes, and read the news. There (27) ______ many good reasons to spend time online.**
- A. has
- B. are
- C. have
- D. is

**Answer: B. are**

**28. However, people with an Internet addiction are online too (28) ______.**
- A. about
- B. with
- C. to
- D. of

**Answer: C. to**

**29. They don't spend time (29) ______ their friends and family.**
- A. to chat
- B. chat
- C. chatting
- D. chatted

**Answer: C. chatting**

**30. People (30) ______ have this problem often go online because they want (31) ______ from the stress and problems in their lives.**
- A. what
- B. who
- C. which
- D. when

**Answer: B. who**

**31. People with Internet addictions don't just go online to shop, have fun, or do work. People (31) ______ have this problem often go online because they want (30) ______ from the stress and problems in their lives.**
- A. escapes
- B. escaped
- C. escaping
- D. to escape

**Answer: D. to escape**

**Find and correct the mistakes in the following sentences:**

**32. Last night, I enjoyed to surf the Facebook very late.**
- Correction: Last night, I enjoyed surfing Facebook very late.

**33. Mr Buong is interested on doing puzzles in his leisure time.**
- Correction: Mr Buong is interested in doing puzzles in his leisure time.

**34. They dislike surf the Net because it takes them too much time.**
- Correction: They dislike surfing the Net because it takes them too much time.

**Complete the sentences with the to-infinitive or -ing form of the verbs in brackets:**

**35. Sue loves (make) origami. She can fold some animals, birds and flowers.**
- Answer: Sue loves making origami. She can fold some animals, birds and flowers.

**36. I detested (spend) two hours every day travelling to work and back.**
- Answer: I detested spending two hours every day travelling to work and back.

**37. He started (surf) the net hours ago. Has he stopped (surf) yet?**
- Answer: He started surfing the net hours ago. Has he stopped surfing yet?

**38. I tried hard (concentrate), but my mind kept (wander).**
- Answer: I tried hard to concentrate, but my mind kept wandering.

**39. I have enjoyed (meet) you. Hope (see) you again soon.**
- Answer: I have enjoyed meeting you. Hope to see you again soon.

**40. My father is not keen on coffee. He prefers (drink) tea.**
- Answer: My father is not keen on coffee. He prefers drinking tea.

**41. I am a little busy. Would you mind (wait) a little longer?**
- Answer: I am a little busy. Would you mind waiting a little longer?

**42. Mobile games are great, but I don't like (play) them for too long.**
- Answer: Mobile games are great, but I don't like playing them for too long.

**43. If I can choose, I prefer (stay) at home to (play) sport.**
- Answer: If I can choose, I prefer staying at home to playing sport.

**44. Tonight I'd like (go) out, but I have to do my homework.**
- Answer: Tonight I'd like to go out, but I have to do my homework.

**Write sentences with the cues given:**

**45. Mai/ usually/listen/ K-pop music/ free time.**
- Answer: Mai usually listens to K-pop music in her free time.

**46. when/ I/ be/ a child/ I/ enjoy/ play/ computer games.**
- Answer: When I was a child, I enjoyed playing computer games.

**47. my father/ spend/ most/ spare time/ look after/ the garden.**
- Answer: My father spends most of his spare time looking after the garden.

**48. My friends/ prefer/ play sports/ to/ surf the Net.**
- Answer: My friends prefer playing sports to surfing the Net.

**Rewrite the following sentences that still keep the same meaning as the root one:**

**49. It takes Son Tung 20 minutes to walk to school a day.**
- Answer: Son Tung spends 20 minutes walking to school a day.

**50. She detested doing DIY after school.**
- Answer: She was not keen on doing DIY after school.

**51. It takes my brother lots of time to surf the Net.**
- Answer: My brother spends lots of time surfing the Net.

**52. Mr Buong wants to work with young children at school.**
- Answer: Mr Buong enjoys working with young children at school.