Although James Cook　　　the first westerner to have discovered Australia,New Zealand and Hawaii,his travels led to the creation of more accurate and reliable maps for vast parts of the world.

He has no idea what the book is about．He        have read it very carefully．

—What a pity! Their experiment is a failure.—They ________ better under more favorable conditions.

If the American government      the expert’s suggestion, the world economy would not be in such a mess now.

— Mary’s got mad and has been sent to the mental hospital. Did you tell her boss about that?— Yes, but I _____ her husband first.