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After visiting different countries, I found _______ very important to learn about table manners.

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

 

My son wants a pet rabbit for long, but I have no time to buy ____ for him.
A.  it    B.  that    C.  one

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

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

 

－ I need something for cutting the paper.

     － Oh, you want a knife? OK, I'll get ______ for you.

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

 

________is dangerous for us to swim in the river alone.

A. It                   B. That                   C. This