31. We to Ha Noi several times, but last summer we by train. A. flew- went B. has flown – went C. have flown - have gone D. have flown - went 32. She blood twenty times so far. A. donates B. has donated C. is donating D. to donate 33. He lectures to foreign tourists about traditional food and games recently. A. gives B. gave C. have given D. has given 34. They have decided to clean up the neighbourhood it is full of rubbish. A. so B. but C. although D. because 35. “Have you ever to Sa Pa? A. arrived B. been C. seen D. visited 36. They donated their blood_______ the victims in the accident last week. A. on B. to C. for D. with 37. We want to bring a lot of_______ to our community through volunteer activities. A. encouragement B. protection C. business D. benefits 38. She wants to support elderly people_______ and without asking for anything. A. educationally B. differently C. willingly D. environmentally 39. He sometimes donates clothes to the local_______ organisation. It will bring them to people in need. A. charitable B. clean C. friendly D. skilful 40. We need to find an effective way to_______ traffic jams because they Have increased rapidly for many years.