I. Choose the best answer to complete the sentence. 1. Lighting accounts____________ 10% to 15% of the electricity bill. a. on b. to c. at d. for 2. Tet is a festival which occurs____________late January or early February. a. on b. in c. at d. from 3. Whenever I meet new words, I always look them ____________in a dictionary a. for b. over c. up d. after 4. They live in the house ______________roof is full of holes. a. which b. of which c. that d. whose 5. This is the woman ___________ in Peru last year. a. who I met her b. who met c. I met d. I met her 6. He promises never________ again. a. to smoke b. smoking c. smoke d. smoked 7. __________he didn't feel well, the boy wanted to stay home from school. a. Even though b. Becauses c. Whene d . Unless 8. It's advisable to ________ things in order to save natural resources. a. recycle b. replace c. reduce d. consume 9. The_________ of hiding eggs on Easter is practiced in many American homes. a. costume b . experience c. celebration d. custom 10. “I'm sorry about the noise." / "__________” a. That's right b. Of course c. It's OK d. You're welcome