-- are the Olympic Games held?
--Every four years.
| A．How often | B．How soon | C．How long | D．When |
______ that no one was ever prepared for it.
| A．So suddenly did the bad news come |
| B．So suddenly the bad news came |
| C．So did the bad news come suddenly |
| D．Did the bad news come so suddenly |
_____ the teacher's suggestion, Tom finally found a way to settle the problem.
| A．Following | B．To follow | C．Follow | D．He followed |
Some 25,000 people were reported ______ in the ever recorded worst earthquake in Iran, which occurred late this month.
| A．were killed | B．to be killed | C．killing | D．to have been killed |
During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.
| A．to be built | B．being built |
| C．having been built | D．built |
_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.
| A．Leaving to wonder | B．Having left to wonder |
| C．Left wondering | D．Left to wonder |