It’s quite normal to ten percent of the cost of a building for a period of six months or so, in case faults are found in it.
Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
They were so far away that I couldn't _____ their faces clearly.
If the boy had _____ the dog alone it wouldn't have bitten him.
With sufficient scientific information a manned trip to Mars should be _____.
_____ inviting guests and not treating them properly!