下面字母组合表示中国中央电视台的是 。
Aunt Lucy will tell us something about her trip to Australia when she______back.
John didn’t give up looking for a job __________ he got an offer from a German company.
— Would you like to go to the cartoon show with me?— It sounds like fun, ______I’m too busy.
All passengers______go through safety check before they take a plane.
_____ carefully, Michael! There’s a school ahead.