Check the meaning of the words in thebox. Then complete the sentences. fastenbook board check in stop offturn back set off come across1 Please sit down and ___ your seat belts.2 We on our journey at 9 a. m.3 We'll in Moscow on the way to China.4 People with children can the plane now.5 The boat will — if the weather's really bad.6 Tell me if you anything interesting.7 If you __ flights early, they cost less.8 How much luggage did you ?​