I. 1. get lost

   2. cut down

   3. made of

   4. in danger

   5. eat out

II. 1. to bring

    2. is sleeping

    3. am using

    4. are; doing

III. 1. I am

     2. Because

     3. Where

     4. because

IV. One possible version:

Now, it is seven in the evening. The family are doing chores. Look! My father is sweeping the floor and cleaning the window. My mother is cleaning the living room. My brother is carrying water. I am washing the dishes. What is my mother doing now? Ha, she is doing the most important work, she is cooking for all of us in the kitchen. Together with our efforts, our house becomes much more beautiful. We feel tired but happy. What a hard-working family this is!