这道英语填空怎么写?what must the competitors do before the bike race?

这道英语填空怎么写?what must the competitors do before the bike race? 脑筋急转弯 What must you do before you return a book to the libra What must you do before you return a book to the library?你来翻 what must people do before thry cross the street in China? what kind of race do the children compete in? 一道初一英语填空题What did the Blacks do before _ to the airport? what ----you do the day before yesterdat? what's the close race what people must to do the ocean 几道初一英语填空1.Before you take the medicine,you must read i_____ 英语填空Do you find it easy ____(ride) a bike?Betty said the whi What do you usually do before the Spring F