Is _______ Qinghai-Tibet Railway plays an important role in China’s railway history the topic that you’re coming to?
--- Hi, Lucy, have you seen the newspaper on the table? --- Oh, yes. I ____ it but I can’t remember where I put it.
____ directly to the sun in summer will do great harm to our skin.
It rained heavily overnight and not until this morning____.
--Do you know what caused the accident? --- No, not yet. The matter _____.
A new museum is being built in our city and it’ll be accessible to the citizens when___ next year.