【題目】In schools, students________ to sweep the floor after school.
A.askB.are askedC.were askedD.will ask
【題目】It's a custom in China to have some tea or other drinks before the meal ________.
A.servesB.servedC.is servedD.will be served
【題目】In many schools, all the students ________ to show their student cards when they enter the library.
A.requiredB.were requiredC.requireD.are required
【題目】Many traffic accidents ________ because drivers use their smart phones while driving.
A.causeB.have causedC.are causedD.were caused
【題目】To make your DIY work perfect, you'd better not start ________ you get all the tools ready.
【題目】A true friend can see the pain in your eyes ________ everyone else believes the smile on your face.
【題目】Chen Wei isn't at school today________ he is taking part in a robot competition in Shanghai.
【題目】Studying in groups is necessary _________________ you want to do well in school.