【2015·湖北】The team are working hard to ___ the problem so that they can find the best solution.
The Klondike was the_____ of one of the biggest gold rushes the world has ever known.
We have to ask them to ____talking in order that all people present could hear us clearly.
Because _____ the whole company, he sometimes has to work around the clock.
When does the next train _____?
The local government decided to ____ the two firms into a big one.