1. 用所给词的适当形式填空

1. （1） —Why do you like elephants?
   

   —Because they are usually (friend).
   

3. （2） Elephants can walk for long time and they never get (lose).

5. （3） He wants to get a necklace（项链） (make) of ivory.

7. （4） We should（应该）plant（植树）more (tree) to save elephants.

9. （5） Don't forget  (bring) your pen here.