407.( )When are the passengers required to wear a seat belt?

395.( )The market has many products with heavy ()

394.( )How would you like me to()you for my error.

393.( )Smiling and laughing has actually been shown to () tension and stress.

392.( )He has refused to offer us any help.Did you know about that?—Yes，but I＇d like to () him to change his minD.

391.( )There are many reasons for a flight ()

390.( )Don＇t Panic!We are trained () and we can ensure your safety.

389.( )There will be some air ()in 10minutes.Please retum to your seat and fasten the seat belt.

388.( )The captain needs to be () of this.

387.( )What is the () of your visit to his city?

386.( )There are () wine glasses in the bag so please handle it carefully.