______________ twice a year, whether it is a car, a bus or a truck, is the rule that every driver must obey in this city.
—You _____ a meal this evening. I had dinner at a restaurant with Tom. —Well, why didn’t you phone me and let me know?
Water, which seems so simple and common, is _____ makes life possible.
_____ she heard the news that she won a scholarship, she was very excited.
American President Obama, together with some members of his government, _____ going to visit China next month.
_____ in the iron cage of the zoo, the tiger got quite angry.