fasten

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fasten

1.When to fasten the seat belt?（）2.Fasten the seat belt while the Fasten Seat Belt Sign is on.（）3.How to put on the life vest?　slip it over the head；fasten the buckles；pull the straps tight around the waist4.Fasten the seat belt while the Fasten Seat Belt Sign is on.5.When to fasten the seat belt?