21、There are many green ____________in the trees．

A．the leaves           B．leaf          C．leaves

20、Before you shut your computer, don't forget to ______________this document．

A．click                     B．save                     C．open

19、Tony ___________birthday parties．

A．likes always         B．always likes         C．always like

18、This is a wolf, and it's _____________European wolf．

A．the               B．a                 C．an

17、Let's ____________football on the playground．

A．play               B．play the           C．to play

16、We have Chinese ______________eight o'clock.．

A．in                 B．to                C．at

15、I switch ______________ the computer and open a new document．

A．at              B．on            C．off

14、My friend, Li Ling, invites me _______________his home．

A．to                    B．for                   C．on

13、He watches the football ______________TV ___________Sunday morning．

A．at；on           B．on；on              C．in；in

12、The zoo has_____________ animals．

A．five thousand           B．thousands          C．five thousands of