5. In order to prolong the usefulness of your things, it is a good thing to make, a regular, A. inventory, B. replacement, C. costing, D. maintenance, 6. Which is NOT the benefit that can be derived in repairing gadgets or, furniture?, A. save time, B. additional work, C. earn extra money, D. environmentally friendly, 7. Which of the following belongs to finishing materials?, A. nails, C. lumber, B. varnish, D. glue