21. The movie brought back many happy memories of my ________. A. childish B. childless C. childhood D. childlike 22. Customs and traditions are ________ from generation to generation A. passed down B. passed up C. passed over D. passed across 23. We are making a great effort to________ our valuable customs for the future. A. prevent B. provide C. preserve D. prepare 24. It now seems certain ________. A. for an election in May B. to be an election in May C. that there will be an election in May D. of an election in May 25. It’s careless ________ to let your children play with fire. A. of you B. with you C. to you D. for you 26. My dad was glad ________ his best friend again after 20 years. A. of meeting B. meet C. to meet D. meeting 27. She was ________ the news of his death. He was so young! A. relieved to hear B. shocked to hear C. pleased to hear D. annoyed to hear 28. She was fully aware ________ . A. that he did not like her B. of he did not like her C. him not to like her D. for his dislike her. 29. There has been a ________ increase in people's income over the last ten years. A. gradual B. gradually C. light D. slightly 30. You’ll be ________ to know your job is safe. A. rude B. sorry C. dramatic D. relieved