Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.
1. The controller of the body is the ______ system. Led by the brain and nerves, it allows us to move, talk and feel emotions.
    A. circulatory                B. digestive                            C. nervous                              D. respiratory
2. _______ system of the body lets us break down the food we eat and turn it into energy.
A. Circulatory               B. Digestive                           C. Nervous                             D. Respiratory
3. Skeletal system of the body is made up of our _______. It supports our body and protects our organs.
    A. bones                        B. museles                              C. nerves                                D. vessels
4. In under a minute, your _______ can pump blood to bring oxygen and nutrients to every cell in your body.
    A. brain                         B. heart                                  C. lungs                                  D. vessels
5. The human _______ system is a series of organs responsible for taking in oxygen and expelling carbon dioxide.
    A. circulatory                 B. digestive                            C. nervous                              D. respiratory
6. A healthy _______ between work and play ensures that everyone has a chance to enjoy their lives.
    A. balance                     B. control                               C. equality                              D. share
7. He likes to _______ a nap for an hour when he arrives home from work.
    A. do                             B. get                                      C. make                                  D. take
8. Look out! That tree ________.
    A. is going to fall           B. will fall                              C. falls     D. will be falling
9. Why are you so sad?”- “I think ________in the exam next week.”
    A. I would fail               B. I will fail                            C. I failed                               D. I fail