Put a correct preposition in each blank space.
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8. I expect to return _____ Shanghai _____ about a week's time to continue _____ my pioneering research _____ why frogs croak _____ night and not _____ the daytime.
8. I expect to return to Shanghai in about a week's time to continue with my pioneering research on/into why frogs croak at night and not in the daytime.
12. Yesterday, I was hurt _____ a fall _____ my home. After that, everything went wrong _____ me, such as knocking my head _____ the wall and the vase _____ the table.
12. Yesterday, I was hurt in a fall at my home. After that, everything went wrong for me, such as knocking my head against the wall and the vase off the table.
18. It's great to meet my cousin whom I hadn't seen _____ 2010.. We spent an hour or so _____ lunch and then _____ his place where we chatted _____ more than an hour.
18. It's great to meet my cousin whom I hadn't seen since 2010.. We spent an hour or so over lunch and then at his place where we chatted for more than an hour.
20. Last night, I dreamed _____ a policeman whispering _____ my left ear that I was _____ arrest _____ possession _____ the most powerful drug _____ the world.
20. Last night, I dreamed of/about a policeman whispering in my left ear that I was under arrest for possession of the most powerful drug in the world.