We should obey the traffic rules in order to keepourselves .

Ladies and gentlemen, please fasten your seat belts. The plane______.[ ]

Tom, why didn’t you go to work today?—Oh, the manager said he no longer wanted to see me again; _____, I was fired

Mrs. Read is good ______ music. She can be good ______ children in the music club.

It ______ that Tokyo will be the host city for the2020 Summer Olympic Games.