To keep safe, all the drivers in cars________ to wear their seat belts.
A.are supposed B.suppose C.were supposed D.supposed
In schools, students________ to sweep the floor after school.
A.ask B.are asked C.were asked D.will ask
It's a custom in China to have some tea or other drinks before the meal ________.
A.serves B.served C.is served D.will be served
In many schools, all the students ________ to show their student cards when they enter the library.
A.required B.were required C.require D.are required
(2017河南备用卷28题)Many traffic accidents ________ because drivers use their smart phones while driving.
A.cause B.have caused C.are caused D.was caused
Annie ______ to the party. She had a wonderful time with us.
A.invites B.is invited C.was invited D.has invited
