Some students found _____ hard to study English well .  

 ----- Which share is meant for me ? ----- You can take _____ half. They are exactly the same.

–What do you think of the man？--I find _____ difficult to work with him. 

—How many students are there in the classroom?—_________. They are all in the lab.

In fact, ＿＿＿is a hard job for the police to keep order in an important football match.