Fasten the seat belt while the Fasten Seat Belt Sign is on.（ ）
举一反三
- When to fasten the seat belt? A: for take-off B: for landing C: during air turbulence D: whenever the Fasten Seat Belt sign is on
- When to fasten the seat belt?
- You may _____ your seat belt when the seat belt sign is switched off. A: release B: return C: fasten D: adjust
- Please fasten your _______. A: belt B: string C: seat belt D: safety belt
- When driving, we are to fasten the seat belt for safety.