________ on ten years of observation and study, Professor Wang announced that everyone dreams every night,whether they realize it or not.
32.How_________I help them to understand when they won’t listen to me?
31.In summer, food will go bad if_________in room temperature.
30.QQ,______you can chat with your friends, makes communication easy.
29.Someone________his car in front of my house and it is blocking my driveway.
28.The film is very humorous but_________can be enjoyed unless you understand English culture.