Look out when crossing the road, _____ you may be hit by a car.

Let’s meet ______ the shopping center ______ seven thirty. [ ]

It’s time to say goodbye to my school . I’ll always remember the people _____ have helped me .

Have you heard of Zhai Mo ______became the first Chinese person to travel around the world in a sailboat?

Oxford University is ________ with tourists for its beautiful old buildings.