I decided to go to the library as soon as I ______

How the big forest fire has _____remains to be a mystery.[ ]

Among the children ________ by the rich couple ________ a clever boy called Tom.

This is our rock-bottom price, Mr Green. —If that’s the case, there’s not much point in further discussion. We _______ as well call the whole deal off. [ ]

________ so much trouble, we failed to complete the task ontime.