Many modern critics of American literature have called Mark Twain, born Samuel Clemens, ______. A: as America's greatest writer B: was America's greatest writer C: America's greatest writer D: to have been America's greatest writer

The greatest problem with the appliances we have now is that _____.

Human beings are the greatest of all species in that they have       ingenuity.

English people ________ . A: have never discussed who is the world’s greatest dramatist B: never discuss any issue concerning the world’s greatest dramatist C: are sure who is the world’s greatest dramatist D: do not care who is the world’s greatest poet and dramatist

The greatest thing about having older siblings is that they ________ everything they have learnt.