It’s difficult ______ this work today.

______ of the land in that district _______ covered with trees and grass. 

—What is on the desk?—There ____ a book and two pens on it. 

 The number of people applying for the job________one hundred，but a number of them________not accepted for various reasons.

Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.