Mary came ______in the Chinese exam. This is _______time she got the good mark.

 Mary came ______in the Chinese exam. This is _______time she got the good mark.

A．first, second                           B．the first; the second

C．first; the second                        D．the first; second

________, we should plant a tree. ________, we should pick up the garbage on the ground.

Complete the sentences with the correct prepositions. (at on in)

We have three public holidays ________ the Chinese New

Year ________ the first, second and third days.