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—You look unhappy .  What’s wrong ?
—I find ____ difficult ______on well with my classmates

–What do you think of the man？

--I find _____ difficult to work with him.

A．him              B．me               C．it                D．that

I find _______ difficult to finish the work on time. We only have three hours left.

A.it                               B. that                     C. its                             D. this

I find _______difficult to get to sleep because the man upstairs made much noise.

    A. it             B. this             C. that             D. him

I find ____ difficult to remember everything, though I’m still young.

A. that        B. this      C. it     D. one