Choose the best answer : Helen is always in the kitchen

6) helen is alway in the kitchen. She enjoys________.
A. Cook.      B. To cook.       C. Cooks.     D. Cooking
7) people find the water dirty ______ there are some wasts chemicals in it.
A. And.       B. As.        C. But.       D. Where
8) he is running so fast, i _______ catch up with him.
A. Can not hardly 
B. Can hardly 
C. Not hardly
D. Could hardly