_____ the Great Green Wall, the land produces (生产出) more crops.

It took us _______ to finish the new research project.

It is not what he said but the way he said it______annoyed me.

What are you looking for—I’m looking for the pen ______ my father gave me last week．

I ________ a book on fashion at this moment，and it ________ in the book that Europeans started towear top hats in the early 1800s.[ ]